It was a stupid thing to say, but Sirius felt like he was drowning. A traitor. James and Lily. A baby. Voldemort killed Lily and, and James. There was a traitor and James was dead and he'd been secret keeper and, and...
If Remus said anything else he didn't hear it. He wanted to throw up, to run, to turn into Padfoot and never turn back because tbus couldn't be real. This couldn't be real, and if he was in Azkaban then it was because he, it was because people had thought he...
"Moony!" He looked back up at his friend, desperate and devastated. "I, I wouldn't. You know I wouldn't betray them. You. The Order. I wouldn't. I couldn't. I, you, James, you're my family, I would never, I would never, I couldn't. You know that, don't you? You have to know that!"