How do you get over it?

We broke up six weeks ago. What happened was twisted and surreal. I loved her very deeply and she's gone forever and I just can't let it go. I think about her all day. Even right now...What is she doing? Who is she with? Is she with somebody else already? How did she get over me so quick if she loved me? All that stuff. I know it's unhealthy but I don't know how to stop. I keep thinking if it was just a regular break up it would be easier. It was just so twisted and messed up. Also, It was the first chick I ever fell for. How do you get it out of your head?