Best way to overcome this will be appreciated not the usual get over it and move on some things people can't get over easily
Most Helpful Guy
Let it be, get past it, an apology's useless at that time. Don't worry about him becoming a better person, just focus on yourself, an apology is the last thing you need (and realistically, people almost never apologize). Just be happy he's gone and don't be so hurt easily, sometimes you have to determine if a relationship is worth it and you have to cut short the torture. Just think about other things right now, don't think about him.
Most Helpful Girl
You are going to be waiting a long time for that apology. I am in the same situation now - it's kind of like, whoever hurt you is the only person who can make you feel better, but that is a cycle of abuse. He's got you hooked. Think about - if a normal person treated another human being so disgustingly, they would have remorse and apologize. The fact that he can abuse you and walk away shows that he is a sociopath and a very dangerous person. He did you a favor, cut him out and move on. He would have destroyed you. Be strong. I heard a great saying the other day -"Don't compromise yourself, you're all you've got". Good luck and be strong:)