Most Helpful Guy
You are [psychologically] attached to your ex because of chemical reactions in your brain. I imagine you probably had sex with him which can amplify that process. That is why it's wise to be cautious before you have sex with someone.
This is why I have a problem with the modern conception of "love", it locks you into your emotions which can and does deceive people. Letting go is difficult but you can do it! First I would try to teach yourself not to think about him and the best way to do that is to remind yourself of what he did to you when he pops in your mind. Secondly, at some point it wouldn't hurt to start talking with new people if for not other reason to distract yourself and to make new friends that could lead to more possibly!
Most Helpful Girl
That isn't true love, that is you denying reality and loving a fantasy of who you wish he would be. Accept the reality and the fantasy will go away and so will the feelings.