Remus felt like he'd just been slapped. He didn't know why Snape's opinion mattered to him, but he didn't want the boy thinking he was capable of something like that. What Sirius had done was a complete betrayal of his trust, and to be accused of being knowingly involved in the incident hurt. Yes, he'd made mistakes and hadn't stood up to James and Sirius the way he probably should have, but to be accused of being capable of murder was something of a shock. And it hurt that someone, even Snape, could think that.
"You don't get it at all, do you, Snape?" he shouted. "It's not just about you! I don't have any control during the moon and Sirius took advantage of that for his petty revenge. If I had hurt you or...god forbid...killed you...at best I would have ended up in Azkaban. Sirius never even consider that...he just...he used me to try and hurt you."
He looked down at his hands. "I thought...I was terrified when they found out what I am," he said softly. "Even my parents couldn't treat me the same after...but James and Sirius accepted it. I thought I finally found people who didn't see me as some monster...but Sirius used me like I was nothing more than that. I've forgiven him for what he almost did to me...I'm not so self-centred as to contemplate forgiving him for what almost happened to you...but I can't forget that, and I don't know if I can forgive it."
He shook his head. "But if you honestly think I could willingly..." he trailed off. "Don't worry yourself, Severus. I'll stay away from you. I'm sure if you address your concerns to Torchwood, they'll be more than happy to relocate you, or put me in a cage. That's where I belong, right?"