Why can't I forget the person who've hurt and leave me?

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I don't know the reason why I can't forget the guy who've hurt me so much. I admit that I've loved him a few years ago and I don't know if I still love him but I can't seem to forget him. All I know at this moment is I can't trust him anymore. What bothers me most was the fact that his memory haunts me and I keep comparing him to my boyfriend which is way better than him. There are times that I miss him and it seems that all the bad things that he'd done to me doesn't matter anymore. Is it for a fact that we didn't have a formal breakup? Am I the only one feeling this way? I really can't understand myself and sometimes I feel that I am betraying my boyfriend because I still keep on remembering my ex boyfriend. Is it a good thing? Is it normal for me to feel that way?