I overreacted and he forgave me, but what could he be thinking now?

I think he knew he wasnt going to get any from you so he got so angry he quit. It seems like his whole purpose was to screw you. Like everything you guys did was for him to get in those jeans. Then he left knowing he cant get any. So he probaby found another girl to do the same to. Then right when they stopped talking he went back to you.