The way HARRY feels about...
... SIRIUS after the reveal that he's not evil is... well, weird:
1) HARRY literally said that he wanted to kill him. Logically he shouldn't hate him anymore but, after feeling that way for I don't know long (the passing of time confused me a little bit), those feelings can't just go away.
2) SIRIUS was in prison for over a decade. That can mess up a person. Actually, the fact that he was the 1st person to succeed in escaping may be a hint.
3) HARRY feels like he can trust him since his parents did. However, HARRY doesn't actually know him. Even if he isn't a bad person, maybe the 2 of them wouldn't get along... and yet HARRY is ready to go live with him?