Sirius snorted derisively. "You can't sell me on running off for my good. They already wanted me dead. Whatever you did wouldn't change that and you knew it. And you thought I didn't give a toss, so you wouldn't have thought I'd put myself out to try to protect you." It didn't add up.
But Regulus was here, some some part of that had to be true. Even if it was probably only half the story at best.
Sirius took a step toward him. "What did you do that he had to nurse you back from, Reggie? And where have you BEEN?"