You said that you broke up with him and there are reasons. If you feel like that, then try to list all those things about him that you hated and the reasons why you broke up with him. Then ask yourself, would you really want to date another guy who had all those bad qualities? Do you really want to put yourself through all that torture again? If you answered no for those two questions, then the answer is clear that someone like your ex is not a guy you want to be with. Tell yourself that he's not worth it and that he's probably a jerk or a loser or a moron or all of the above. It is not worth it for you still have feelings and essentially mourn over your relationship with him if he is like that.
If that doesn't work, then try to meet new people. It may not always be the best way, but it sure works most of the time. Getting over someone by liking someone else is actually quite effective. Although at first you may seem like you're using that other person, eventually you might actually like him, which actually happens quite often.
If none of those work, feel free to talk to me again. Maybe I can come up with better suggestions when I'm not sleep deprived (haha). Anyway, I wish you luck!