Maybe he felt as if you did not like him and that you were not intrested in him. So, he thought that you and him were not in a relationship so he decided to take this other girl out to the movies. YOu must meet him half way here. Once one of you makes a move, the other one must make a move too. Talk to him, he is probably just confused. Talk to him and see what happens. If you two are ment to be, than you have nothing to worry about. Good luck, and remember.... you two are in this together!!! I would give him a second chance, who knows, this could turn out to be something great!!!