Why do I still miss him?

It has been a month since I last saw him... I still think about him every day. He hurt me like nobody else before. I had never felt pain like this before. I don't want him back, but I still care for him. Why do I still miss him, when I know pretty well he doesn't miss me? Why when I feel a little bit of relief and think I'll be happy, his memory comes back to haunt me? Why can't I just hate him for all his lies and deception? Why do I still want him to love me if I know he is not good for me? Why do I still want him to be happy even if it's not with me?... I know I need to move on. I'm working hard on doing so, but why, why, why I still miss him??