Sirius shoved him even harder. "Poor baby Regulus! You didn't have anybody because you didn't try. You can't even take responsibility for what you've done! LOOK AT YOU! After you joined those bastards, I didn't want you to be my brother. You had choices, Regulus! And you made the wrong ones! That's on you NOT ME. You want to be a petty fuck and be jealous because James and I got on better than you and I ever did, you do that."
Sirius wanted nothing better than to knock Regulus down. He wanted a fight. Regulus said his piece to McGonagall, it was Sirius' turn now, apparently. However he was trying very hard not to hit him.
"You would have had someone if you had stepped up and said something. You could have walked out that door and would have been better off by yourself than what you've become but again, you were a coward. You were afraid. You didn't leave because you didn't want to, that's all it was. Why the fuck should I have talked to you? We would have had nothing to say to one another."