Why wont he talk to me?

He feels like you were playing with him and you didn't take him seriously because you didn't wan to end things with your current boyfriend. Hes probably mad because he isn't getting the attention he wanted. Give him time and space. Maybe he'll come around. If he doesn't, don't worry too much about him. If that's how his logic works, things between you two wouldn't last. I know it's hard and painful to move on, but sometimes it's for the better. Good luck