* Originally posted 10/16/2013
This is my rebuttal to some of the stuff about Lupin, with actual TEXTUAL evidence. All page numbers refer to the US Hardcover editions.
I first want to start by quoting a very good essay (I highly recommend reading all of it) that was written after the fifth book that says,
There seems to be the consensus that Remus disapproved of Sirius and James's actions in Chapter Twenty-Nine but that, due to the fact he had a fear of being rejected by his only friends, he was too afraid to say anything. This, given every single thing we've seen of Remus Lupin, makes absolutely no sense to me. So, what follows is my analysis of the character of Remus Lupin based on canon and the extrapolations thereof, and why such analysis proves that Remus was not afraid but indifferent.
It goes on to say,
What his actions do display tells a very different story than that of a shy, nearly timid boy who's afraid of upsetting those around him and inciting rejection. Frankly, Remus is secretive and manipulative, controls everything around him, has little to no deference for authority, and has a very dry wit with a morbid sense of humour to boot. This is not a timid boy afraid of himself and his surroundings. This is not a good man, morally responsible and wanting to do the right thing. This is a realist who has gotten the bad end of things in life and, even through these experiences, comes out strong and fully in-control in the end.
Then, of course, there is Remus's behaviour in the Shrieking Shack in Prisoner of Azkaban. Throughout the scene, even as he is being outed as a werewolf, something he has every reason to fear, and recollecting the painful transformations of his youth, Remus is in control, calm, and collected. Even when he discovers that he has been gravely mistaken about the entire cause of the last twelve years of his life, he remains unflustered. He merely processes, accepts, and moves on. And even when he is telling a man he believed, until a mere half an hour earlier, to be a victim of a heinous betrayal and murder, that he should have *known* that Remus and Sirius would kill him, he does so coolly. He states: "You should have realized," said Lupin quietly, "if Voldemort didn't kill you, we would. Good-bye, Peter." (p. 375, PoA, US Paperback edition). There is no rage, as Sirius and Harry display (the latter displaying rage towards Sirius when he believed him guilty), just a calm, quiet certainty and cold-blooded murder.
Of course, all those behaviours are in complete concurrence to Remus's other, less sinister, behaviours. Remus is a man who is completely in control of the situation around him. Not only does he lead the situation in the Shrieking Shack (he is the one that convinces Sirius to calm down and explain and convinces Ron to give him a rat and then, once the situation is diffused, puts people into order so that they can return to the castle) but he displays the same qualities in Order of the Phoenix. In Chapter Five, during which they have dinner, an argument arises, the contention being whether or not Harry should be allowed information. Sirius, who is strong-willed and stubborn, argues that he should. Molly Weasley, who is easily as strong-willed and stubborn, argues that he shouldn't and it quickly becomes a shouting match that no one is willing to intervene in, even when dragged in (see Mr. Weasleys' non-committal answers). No one, that is, except Remus who says: "Molly, you're not the only person at this table who cares about Harry," said Lupin sharply. "Sirius, sit down." (p. 90, OotP, US Hardback edition). Both Molly and Sirius comply and then Remus adds: "I think Harry ought to be allowed a say in this," Lupin continued. "He's old enough to decide for himself." (see note immediately above). That decides it. Then, in the drama that follows concerning the rest of the children and whether they will be allowed to stay, Sirius's mother's portrait is upset and Remus leaves to deal with her. However, "It was only after he had returned, closing the kitchen door behind him and taking his seat at the table, that Sirius spoke." The conversation continues, with Harry asking questions and the group doing the best they can to answer them, when Sirius allows information Molly does not find acceptable to slip. Molly immediately attempts to end the conversation but is met with argument. However, then Remus speaks up, first saying no and then explaining why he said as much. The reaction is this: "Sirius half-shrugged but did not argue. Mrs. Weasley beckoned imperiously to her sons and Hermione. One by one they stood up and Harry, recognising defeat, followed suit." (p. 97, OotP) It's fully clear that throughout the scene Remus is in control of the decisions. That he is, effectively, the authority on site.
This isn't even the first example within Order of the Phoenix that has Remus taking charge of a situation. Remus is, if not the leader of the guard to pick up Harry in Chapter Three, then at least its co-leader and its ambassador. Remus spends most of the scene directing people, including Alastor "Mad-Eye" Moody, who would seem to have authority, and answering Harry's questions, making certain that Harry remains calm. Nor is it the last example. Throughout the book Remus seems to have a hand in many of the situations, using his ability to calm down Molly, control Sirius, and make certain that Severus and Sirius do not kill each other. Not only is this an example of Remus's ability to dominant a situation without appearing controlling, but it also shows his people skills. That alone debunks the idea of Remus being shy or even reserved. Shy implies that one is avoidant of something, whether it be interpersonal interaction or responsibility or control, and Remus never shies away from any of these things. Even when he doesn't become involved, he isn't avoidant. For example, he doesn't avoid responsibility, he merely chooses when and when not to exercise it.
So let's keep all of that in mind as we continue, shall we?
Pottermore: Remus functioned as the conscience of this group, but it was an occasionally faulty conscience. He did not approve of their relentless bullying of Severus Snape, but he loved James and Sirius so much, and was so grateful for their acceptance, that he did not always stand up to them as much as he knew he should.
Inevitably, his three best friends soon became curious as to why Remus had to vanish once a month. Convinced by his lonely childhood that his friends would desert him if they knew that he was a werewolf, Remus made up ever more elaborate lies to account for his absences. James and Sirius guessed the truth in their second year. To Remus’s astonished gratitude, they not only remained his friends but thought up an ingenious method of easing his monthly isolation. They also gave him a nickname that would follow him all through school: ‘Moony’. Remus finished his school career as a Prefect.
You (JKR) have, in just one sentence, excused the bullying. Is that the message you want to send to your young readers? Because, “he did not approve, but they were so accepting and loving it doesn't really matter.” is what I'm getting from it. Now, let's look at the textual evidence of this – note that Pottermore says nothing about the incident of Severus almost getting killed, or SWM.
“A thought that still haunts me,” said Lupin heavily. “And there were near misses, many of them. We laughed about them afterwards. We were young, thoughtless – carried away with our own cleverness.
“I sometimes felt guilty about betraying Dumbledore's trust, of course... he had admitted me to Hogwarts when no other headmaster would have done so, and he had no idea I was breaking the rules he had set down for my own and others' safety. He never knew I had led three students into becoming Animagi illegally. But I always managed to forget my guilty feelings every time we sat down to plan our next month's adventure. And I haven't changed...” (PA 355-6)
So that famous conscience wasn't even at work with himself, much less the others. Not to mention he actively participated in coming up with the plans and laughing about the close calls. Not exactly the behavior of someone completely blameless, is it? Let's continue looking at this.
Lupin's face hardened, and there was self-disgust in his voice. “All this year, I have been battling with myself, wondering whether I should tell Dumbledore that Sirius was an Animagus. But I didn't do it. Why? Because I was too cowardly. It would have meant admitting that I'd betrayed his trust while I was at school, admitting that I'd led others along with me... and Dumbledore's trust has meant everything to me. He let me into Hogwarts as a boy, and he gave me a job when I have been shunned all my adult life, unable to find paid work because of what I am. And so I convinced myself that Sirius was getting into the school using Dark Arts he learned from Voldemort, that being an Animagus had nothing to do with it... so, in a way, Snape's been right about me all along.” (PA 356)
Again, when his conscience started to come out and say what was going on wasn't right, he quickly silenced it, convincing himself it didn't matter.
Yes, he speaks “heavily”, his face is “hardened”, there is “self-disgust”, and he calls himself “cowardly.” But that never changes his actions. It just proves that he knows what's going on is wrong, which makes his refusal to make things better worse. Deep in his heart he knows it isn't right (which we can't say about James or Sirius), but he'll go to any length to excuse it and deny that.
Also, the text states twice that Remus “led” the others into becoming Animagi. To lead means “to guide the behavior or opinion of.” He wasn't just in the background, eternally grateful. He was an active participant – as we will continue to see. Let's move on to the Whomping Willow incident with Severus.
“Professor Snape was at school with us. He fought very hard against my appointment to the Defense Against the Dark Arts job. He has been telling Dumbledore all year that I am not to be trusted. He has his reasons... you see, Sirius here played a trick on him which nearly killed him, a trick which involved me -”
Black made a derisive noise.
“It served him right,” he sneered. “Sneaking around, trying to find out what we were up to... hoping he could get us expelled...”
“Severus was very interested in where I went every month,” Lupin told Harry, Ron, and Hermione. “We were in the same year, you know, and we – er – didn't like each other very much. He especially disliked James. Jealous, I think, of James's talent on the Quidditch field... anyway, Snape had seen me crossing the grounds with Madam Pomfrey one evening as she led me toward the Whomping Willow to transform. Sirius thought it would be – er – amusing, to tell Snape all he had to do was prod the knot on the tree trunk with a long stick, and he'd be able to get in after me. Well, of course Snape tried it – if he'd got as far as this house, he'd have met a fully grown werewolf – but your father, who'd heard what Sirius had done, went after Snape and pulled him back, at great risk to his life... Snape glimpsed me, though, at the end of the tunnel. He was forbidden by Dumbledore to tell anybody, but from that time on he knew what I was...” (PA 356-7)
So Snape was just jealous of James's skills, Sirius just wanted to play an amusing joke, and James heroically risked his life to save Snape. Ahh, no. Severus disliked the Marauder's because they severely bullied him, Sirius almost got him killed, and James saved Severus only to spare the Marauder's (not to mention he's an Animagus, so all he would have to do is change forms to be fine). We know that because SWM takes place after this incident, and we see no change in any of their behavior. We don't get told if the Marauder's ever get a punishment, only that Severus got told shut up or else. Now, by this time Remus has been made a Prefect. Let's move on to SWM, shall we?
Sirius, who was right beside Harry, let out his usual barklike laugh.“No one would have made me a prefect, I spent too much time in detention with James. Lupin was the good boy, he got the badge.”“I think Dumbledore might have hoped that I would be able to exercise some control over my best friends,” said Lupin. “I need scarcely say that I failed dismally.” (OP 170)
A short stop here. Lupin's joking about being a Prefect and not controlling his friends. So much for being their conscience.
When he had finished, neither Sirius nor Lupin spoke for a moment. Then Lupin said quietly, “I wouldn't like you to judge your father on what you saw there, Harry. He was only fifteen -”
“I'm fifteen!” said Harry heatedly.
“Look, Harry,” said Sirius placatingly, “James and Snape hated each other from the moment they set eyes on each other, it was just one of those things, you can understand that, can't you? I think James was everything Snape wanted to be – he was popular, he was good at Quidditch, good at pretty much everything. And Snape was just this little oddball who was up to his eyes in the Dark Arts and James – whatever else he may have appeared to you, Harry – always hated the Dark Arts.” (OP 670)
Remus, you're making excuses again. Sirius, the Dark Arts don't equal Evil and you and James are two of the biggest users of it I've ever seen. Also, it was not “just one of those things”, DH shows us that James (and then you) started bullying Severus on the train just because you didn't agree with his house of choice. That is not some mutual thing where they “hated each other from the moment they set eyes on each other.” Also, you (like Remus) are trying to excuse it as Severus just being jealous – although your “little oddball” comment contradicts your comment about him being in a gang that all turned into Death Eaters (notice we never actually see them defend Sev, or even hang around him, really. Funny, that).
Also, JKR, mistake – according to DH James's birthday is in March, so he was already sixteen. Let's continue.
“Yeah,” said Harry, “but he just attacked Snape for no good reason, just because – well, just because you said you were bored,” he finished with a slightly apologetic note in his voice.
“I'm not proud of it,” said Sirius quickly.
Lupin looked sideways at Sirius and then said, “Look, Harry, what you've got to understand is that your father and Sirius were the best in the school at whatever they did – everyone thought they were the height of cool – if they sometimes got a bit carried away -”
“If we were sometimes arrogant little berks, you mean,” said Sirius.
“He kept messing up his hair,” said Harry in a pained voice.
Sirius and Lupin laughed.
“I'd forgotten he used to do that,” said Sirius affectionately.
“Was he playing with the Snitch?” said Lupin eagerly. (OP 670)
'Sometimes a bit carried away'? Really? We're talking about the incident where they not only go after him for no reason, do humiliating and aggressive things like washing his mouth out with soap (which actually makes him gag and choke), and sexually assaulting him (taking off someone's underwear and showing their privates against their consent in front of a crowd is definitely sexual assault). Also, Sirius, you are proud of it. If you weren't you would have shown one sign of regretting it, and you don't. You just excuse it.
Look at Lupin. He's smiling, he's laughing, he's eagerly looking for Harry to share details about James, all on top of excusing it. He doesn't care, much less greatly disagree with it.
“Yeah,” said Harry, watching uncomprehendingly as Sirius and Lupin beamed reminiscently. “Well... I thought he was a bit of an idiot.”
“Of course he was a bit of an idiot!” said Sirius bracingly. “We were all idiots! Well – not Moony so much,” he said fairly, looking at Lupin, but Lupin shook his head.
“Did I ever tell you to lay off Snape?” he said. “Did I ever have the guts to tell you I thought you were out of order?”
“Yeah, well,” said Sirius, “you made us feel ashamed of ourselves sometimes... That was something...” (OP 670-1)
Look at what Remus says. In his own words he admit's to never telling them off about bullying Severus – and Sirius doesn't disagree, shown by his “yeah, well...”. Lupin's words make it sound like there were a few times he didn't agree but didn't say anything. Sirius disagrees with that, saying “you made us feel ashamed of ourselves sometimes.” And note that none of this is connected to bullying Severus as both men imply that Remus never said anything (and if he told them they were 'out of order' towards Severus, that would be telling them to lay off).
“And,” said Harry doggedly, determined to say everything that was on his mind now that he was here, “he kept looking over at the girls by the lake, hoping they were watching him!”
“Oh, well, he always made a fool of himself whenever Lily was around,” said Sirius, shrugging. “He couldn't stop himself showing off whenever he got near her.”
“How come she married him?” Harry asked miserably. “She hated him!”
“Nah, she didn't,” said Sirius.
“She started going out with him in seventh year,” said Lupin.
“Once James had deflated his head a bit,” said Sirius.
“And stopped hexing people just for the fun of it,” said Lupin.
“Even Snape?” said Harry.
“Well,” said Lupin slowly, “Snape was a special case. I mean, he never lost an opportunity to curse James, so you couldn't really expect James to take that lying down, could you?”
“And my mum was oaky with that?”
“She didn't know too much about it, to tell you the truth,” said Sirius. “I mean, James didn't take Snape on dates with her and jinx him in front of her, did he?” (OP 671)
Actually, Lupin, Severus and the detention slips disagree with you on that. You're excusing it when there is no excuse. We never, not once, see Severus start it. And the fact you four have the Map, plus Lily not knowing anything about it, gives the conclusion that yes, James did start it. If Severus had, there would be no reason to hide it from Lily, James would have bragging rights I'm sure he'd use, James has the power of being Head Boy, and it would probably be done in public, where the whole school would then find out. The fact that no one, not even Lily knew, leads one to believe that you four started it.
Sirius frowned at Harry, who was still looking unconvinced.“Look,” he said, “your father was the best friend I ever had, and he was a good person. A lot of people are idiots at the age of fifteen. He grew out of it.”“Yeah, okay,” said Harry heavily. “I just never thought I'd feel sorry for Snape.” (OP 671)
Actually, all the evidence we have goes against the idea of James changing, but here and now is not the place to discuss that. We're going to move on now to what Pottermore has to say about Harry's third year, and then what the text actually says.
Pottermore: Once again, Albus Dumbledore changed the course of Remus Lupin’s life when he tracked him down to a tumbledown, semi-derelict cottage in Yorkshire. Delighted to see the Headmaster, Remus was amazed when Dumbledore offered him the post of Defence Against the Dark Arts teacher. He was only persuaded to accept when Dumbledore explained that there would be a limitless supply of Wolfsbane Potion, courtesy of the Potions master, Severus Snape.
At Hogwarts, Remus revealed himself to be a gifted teacher, with a rare flair for his own subject and a profound understanding of his pupils. He was, as ever, particularly drawn to the underdog, and both Neville Longbottom and Harry Potter benefited from his wisdom and kindness.
However, Remus’s old flaw was at work. He had grave suspicions about one of his old friends, a known fugitive, but did not share them with anyone at Hogwarts. His desperate desire to belong and to be liked meant that he was neither as brave nor as honest as he ought to have been.
An unfortunate combination of circumstances arose that resulted in Remus undergoing a true werewolf’s transformation on the grounds of the school. Severus Snape’s resentment, never abated by Remus’s subsequent respectful politeness, made sure that it was widely known what the Defence Against the Dark Arts teacher was. Remus felt obliged to resign and departed Hogwarts once more.
We already went over the supposed “old flaw.” Let's look at what the actual text shows. I will be disproving other points as we go along, and I want to point out that respect means “to feel or show deferential regard for” and polite means “marked by or showing consideration for others, tact, and observance of accepted social usage.” We'll see if that supposed “respectful politeness” was ever there.
Professor Lupin had raised his eyebrows.
“I was hoping that Neville would assist me with the first stage of the operation,” he said, “and I am sure he will perform it admirably.”
Neville's face went, if possible, even redder. Snape's lip curled, but he left, shutting the door with a snap. (PA 132)
Lupin's behavior is perfectly acceptable here. He's tactful to the situation, but not Severus personally, like Pottermore implies.
Nearly everyone laughed. Even Neville grinned apologetically. Professor Lupin, however, looked thoughtful.
“Professor Snape... hmm... Neville, I believe you live with your grandmother?”
“Er – yes,” said Neville nervously. “But – I don't want the boggart to turn into her either.”
“No, no, you misunderstand me,” said Professor Lupin, now smiling. “I wonder, could you tell us what sort of clothes your grandmother usually wears?”
Neville looked startled, but said, “Well... always the same hat. A tall one with a stuffed vulture on top. And a long dress... green, normally... and sometimes a fox-fur scarf.”
“And a handbag?” prompted Professor Lupin.
“A big red one,” said Neville.
“Right then,” said Professor Lupin. “Can you picture those clothes very clearly, Neville? Can you see them in your mind's eye?”
“Yes,” said Neville uncertainly, plainly wondering what was coming next.
“When the boggart bursts out of this wardrobe, Neville, and sees you, it will assume the form of Professor Snape,” said Lupin. “And you will raise your wand – thus – and cry 'Riddikulus' – and concentrate hard on your grandmother's clothes. If all goes well, Professor Boggart Snape will be forced into that vulture-topped hat, and that green dress, with that big red handbag.”
There was a great shout of laughter. The wardrobe wobbled more violently. (PA 135)
This is your 'wisdom and kindness'? How is Neville benefiting from it? I have no problems admitting that Remus helped Harry with the Patronus, but Harry's not an underdog, and this doesn't help Neville – if anything, it hurts him. Also, we never see any sign of a 'rare flair for his own subject' – he's better than Quirrell and Lockhart, certainly, but that's not saying much.
Note that it was all Lupin's idea. He has to plainly tell Neville what to do, instead of Neville coming up with something of his own (which would, incidentally, help with Neville's confidence). Look at his behavior. He's thoughtful, then he's smiling, then he's prompting, and finally he tells Neville what to do. Lupin was in the Order with Frank and Alice, I would be extremely surprised if he had never met Augusta, much less hear about her fashion choices. And he makes sure to include all of them, reminding Neville that she would have a handbag.
Yes, Neville has to do something funny. But there is no reason to take it to this extreme of publicly humiliating and emasculating Severus. Especially when you and your friends used to severely bully him. There is no 'respectful politeness' in this scene.
The door opened, and in came Snape. He was carrying a goblet, which was smoking faintly, and stopped at the sight of Harry, his black eyes narrowing.
“Ah, Severus,” said Lupin, smiling. “Thanks very much. Could you leave it here on the desk for me?”
Snape set down the smoking goblet, his eyes wandering between Harry and Lupin.
“I was just showing Harry my grindylow,” said Lupin pleasantly, pointing at the tank.
“Fascinating,” said Snape, without looking at it. “You should drink that directly, Lupin.”
“Yes, yes, I will,” said Lupin.
“I made an entire cauldronful,” Snape continued. “If you need more.”
“I should probably take some again tomorrow. Thanks very much, Severus.”
“Not at all,” said Snape, but there was a look in his eye Harry didn't like. He backed out of the room, unsmiling and watchful. (PA 156)
This is not the place to get into it, but due to the past abuse all of Severus' senses must be on alert. He already thinks Remus is helping Sirius, and he's anxious enough that he won't even have the vulnerability of having his back towards Remus – which says a lot.
This also disproves another one of the Pottermore points – we see that pattern of Remus delaying of taking his potion, so I highly doubt “he was only persuaded to accept when Dumbledore explained that there would be a limitless supply of Wolfsbane Potion.” Let's look at another quote from the book, from Severus, “I've just been to your office, Lupin. You forgot to take your potion tonight, so I took a gobletful along.” (PA 358) Now, we know that Remus only has to take the potion once in the week preceding the full moon (PA 352-3). Why the constant wait each time? He could easily have taken it a lot earlier than the day of, and both times we see Severus have to bring it to him.
Let's look at the actual conversation between them. The text says Lupin is speaking 'pleasantly'. Pleasant means “having pleasing or agreeable manners, appearance, habits, etc.” It is not necessarily genuine. Also look at what he says – he asks Severus to just put it down, then points out the grindylow. When Severus says he should take it, Lupin says “yes, yes, I will.” That is the kind of thing you say if you are being hassled and are annoyed. Then, when Severus refuses to drop it, he says he “should probably” take some more the next day, again thanking Severus and bringing the conversation to a halt.
Now why do this? It's not that he doesn't want to take the potion in front of Harry, as he will do so right afterwards. Why refuse to do it in front of Severus? The only thing that does is needle Severus, and have a slight power-play (with Severus losing) in front of Harry. No 'respectful politeness' here.
“Mr. Moony presents his compliments to Professor Snape, and begs him to keep his abnormally large nose out of other people's business.”
Snape froze. Harry stared, dumbstruck, at the message. But the map didn't stop there. More writing was appearing beneath the first. (PA 287)
I would like to point out that the Lupin-in-the-map is the first one to insult Severus. More proof about how he actively participated in their school days, but I'm putting it here because I'm sure Severus recognized the nicknames and that's why he called Lupin.
“You called, Severus?” said Lupin mildly.
“I certainly did,” said Snape, his face contorted with fury as he strode back to his desk. “I have just asked Potter to empty his pockets. He was carrying this.”
Snape pointed at the parchment, on which the words of Messrs. Moony, Wormtail, Padfoot, and Prongs were still shining. An odd, closed expression appeared on Lupin's face.
“Well?” said Snape.
Lupin continued to stare at the map. Harry had the impression that Lupin was doing some very quick thinking.
“Well?” said Snape again. “This parchment is plainly full of Dark Magic. This is supposed to be your area of expertise, Lupin. Where do you imagine Potter got such a thing?”
Lupin looked up and, by the merest half-glance in Harry's direction, warned him not to interrupt.
“Full of Dark Magic?” he repeated mildly. “Do you really think so, Severus? It looks to me as though it is merely a piece of parchment that insults anybody who reads it. Childish, but surely not dangerous? I imagine Harry got it from a joke shop -”
“Indeed?” said Snape. His jaw had gone rigid with anger. “You think a joke shop could supply him with such a thing? You don't think it more likely that he got it directly from the manufacturers?”
Harry didn't understand what Snape was talking about. Nor, apparently, did Lupin.
“You mean, by Mr. Wormtail of one of these people?” he said. “Harry, do you know any of these men?”
“No,” said Harry quickly.
“You see, Severus?” said Lupin, turning back to Snape. “It looks like a Zonko product to me -”
Right on cue, Ron came bursting into the office. He was completely out of breath, and stopped just short of Snape's desk, clutching the stitch in his chest and trying to speak.
“I – gave – Harry – that – stuff.” he choked. “Bought – it... in Zonko's... ages – ago.”
“Well!” said Lupin, clapping his hands together and looking around cheerfully. “That seems to clear that up! Severus, I'll take this back, shall I?” he folded the map and tucked it inside his robes. “Harry, Ron, come with me, I need a word about my vampire essay – excuse us, Severus -” (PA 287-9)
Since Remus is just going to turn around and be emotionally manipulative by using Harry's parents' death against him, I'm pretty sure he bailed Harry out because he didn't want Severus to get confirmation that the Marauder's made the map and used it to bully him. He is first mild, and then cheerful. Mild means “moderate in type or degree or effect or force.” He's still being outwardly pleasant, but not genuine, by trying to make it look like Severus has no idea what he's talking about.
“He'll be delighted,” said Lupin cooly. “He assigned that essay hoping someone would realize what my symptoms meant... Did you check the lunar chart and realize that I was always ill at the full moon? Or did you realize that they boggart changed into the moon when it saw me?” (PA 346)
You gave him no reason to trust you, needling him and repeatedly delaying on taking your potion, not to mention mysteriously spending alone time with Harry. Tipping Harry's best friend off to the danger was the least he could do (I highly doubt he thought anyone other than Hermione would have the knowledge or do the homework).
“Severus, you're making a mistake,” said Lupin urgently. “You haven't heard everything – I can explain – Sirius is not here to kill Harry -”
“Two more for Azkaban tonight,” said Snape, his eyes now gleaming fanatically. “I shall be interested to see how Dumbledore takes this... He was quite convinced you were harmless, you know, Lupin... a tame werewolf -”
“You fool,” said Lupin softly. “Is a schoolboy grudge worth putting an innocent man back inside Azkaban?” (PA 359)
More excuses and insults – Sirius just said Severus deserved it, making it more than some old grudge. And it was never a grudge, or at least not in the way Lupin says it. It was severe bullying. Lupin directly insults Severus this time, instead of being underhanded about it – fool means “one who is deficient in judgment, sense, or understanding.”
“No. Professor Dumbledore managed to convince Fudge that I was trying to save your lives.” He sighed. “That was the final straw for Severus. I think he loss of the Order of Merlin him him hard. So he – er – accidentally let slip that I am a werewolf this morning at breakfast.” (PA 423)
No, you proved him right that you were concealing essential information (thereby helping Sirius), you refused to take your potion and then you rushed off, thereby transforming and almost eating three students. That is why Severus outed you – you unequivocally proved that you were a serious danger to those around you.
And none of this even comes close to “an unfortunate combination of circumstances”, nor was it Severus' “resentment.” Resentment means “indignation or ill will felt as a result of a real or imagined grievance.” Severus had a very good reason for what he did, and this idea that it's all his fault is nothing but prejudice.
Hwyla had a great response to this, which I wish to share:
Just to compound the situation with the Map and Harry's visit to Hogsmeade - this isn't actually Lupin's fault but it exacerbates Snape's suspicions - we now know that Snape was probably fully aware of exactly WHO Mooney, etc. were. After all, he does say something about believing Harry got it from the 'source'. This is the first Hogsmeade weekend since the last one where he found Lupin & Harry at tea when he delivered the wolfsbane which just so happens to be the very same day that Sirius makes it to Gryffindor's door.
One must remember that Snape voiced the opinion that night that he believed Sirius had help entering the castle. On that very same night that Snape saw Lupin being 'pals' with Harry over tea. In Snape's eyes, he is seeing a DE and werewolf working together to get to Harry. He's not picturing 'nice' Lupin, he's remembering how Fenir Greyback worked with DEs. He sees this as Lupin softening Harry up to trust him, so he can hand him over to Sirius, who Snape knows well has no compunction against using Remus' werewolf form to attack.