Is there any chance of me and my ex getting back together some day?

Wow! That's a lot of breaking up and getting back together! I don't know what you see in this guy if he keeps dumping you. I personally don't think that you should get back together. I'm sure you will, but it will probably end up in another break up. I could be wrong, so you do what you think is right. If I were you, I would go up to him and talk to him. I would apoligize for treating him like I did and then say that I wanted to be friends and nothing more. Do what you think is right! Good luck! (: