Sirius held his cup in both hands, tea ignored. "I'm not sure if that makes it better or worse." He admitted, though it was probably better that way. He wanted to tell Regulus that he could have trusted him, but he knew better - they'd been too different then - and he hated that he couldn't tell his brother that. When they were younger it could have been true, he might not have gotten on with their parents but Regulus had always been separate from them in his mind, at least in the beginning.
"I should have asked, there are so many things I should have done - and I'm sorry for that." He said finally, sighing lifting his gaze from the cup in front of him to his brother. "I really am a terrible brother, but I think you knew that already. I really don't know why you put up with me anymore."
"Oh I'll be nice," Sirius waved a hand off at his brother. "Besides it's not like I have occasion to see him often." Which of course would make it much easier to be nice to just about anyone. "I'll make sure you get to see it."