I'm currently going through a break up, and I thought I'd share something I do that helps. Maybe it will help others.

It's a little odd, so bear with me. But what I do, is I make up a story about her in my mind. A crazy story, that would be stretching it to be real, but not impossible. For example, I made up a story where my ex drove up to my apartment, and started rubbing it into my face that she doesn't love me and she's glad she broke up with me. In my story I then call her out, she leaves unsatisfied, and my roommates tell me that she is crazy once she leaves.

Then, whenever I think of her, I instead think of the story. This works for me for a couple of reasons. In the back of my mind I know it never happened, so if I ever run into her in real life, I won't hold it against her. Secondly, when I don't see her, I can pretend it did happen, and I can shake my head and say "she is crazy".

Strange, I know, but it works for me. In my experience, this helps get past the "thinking-of-her-every-second" stage of the break up.