Fuyuko7 gave great advice. I too think you should focus on the bad aspects of the ex, and realize how lucky you are for being free of the jerk who hurt you. You need to focus on yourself and feel awesome as an individual. After her divorce, my mother was absolutely crushed on many levels, but she's just fine now. She looked at herself in the mirror and reassured herself that everything was going to be fine.
See it this way: You were born single. There is no reason to be upset with that fact.
Hope I helped. Good luck to you on the road to recovery.