I think that one way to get over your ex is to really process the reason for the breakup. He wanted another woman, and broke up with you so he could date her again. You were probably a rebound, and he wasn’t really yours — especially since you said it was a very short relationship. It’s very simple to fantasize what isn’t real. That’s why the movies are such a great escape! You don’t go through the rigors of a real relationship when you sit with a movie star in the movies for two hours, and if you can understand that what you had with your ex — that it was a great treat, but not a relationship with a future, you’ll be better able to see it for what it is. That should help you move on.