Can't sleep... Help me please!?

I started talking to this dude, he had broken up with his gf who had cheated on him 2ice with his bff. He went back to her. Then, while talking about it, it turned out that we both liked each other so he left her. I got super attached to him in the last month or so, and a week ago we had . Now he's acting pretty much as a f***ing jerk. We even had plans of moving in together... Now i don't know what the hell he's thinking or why the f*** he's acting like that... I'm getting pretty tired of putting up with his crap, but im willing to keep trying if there's actually a hope to get our relationship working again... Is there? And if it isn't, how should i tell him? I don't wanna b the same as him, i really wouldn't wanna hurt him