I thought I was over her. It turns out I am not?

Me and my girlfriend broke up a few months ago and I have missed her ever since. I spent months completely lovesick and depressed. In the last couple of week though, things started to get better and I thought I was getting over her. Maybe I was. Unfortunately I recently made the mistake of looking at her facebook profile and now I am feeling depressed again. I still love her but I want to get over here COMPLETELY. How do I do this?