One thing that helped me and still helps from time to time...
I remind myself of all the women in the world who have been treated badly. I'm not the only one.
I think of Jackie Kennedy. I think of Sandra Bullock. Jennifer Aniston. Maria Shriver.
These are smart, beautiful women. They are successful and considered worldly beauties. Yet, they were left.
If someone can cheat on Jackie Kennedy? Well, then, it must not have anything to do with beauty, brains, grace or the like. She charmed de Gaulle for Pete's Sake@!
When I look at their situations, it's obvious the problem was--like Bea mentioned--they were with people who didn't value fidelity and commitment. I agree that there is heavy emotional abuse woven in most of the situations found on these boards. Honestly looking at the issues of the abuser will set you free from the feelings of worthlessness within yourself.
"You know, it's times like these when I realize what a superhero I am." Tony Stark/Iron Man
“Focus on what you can do, then do it with all your heart.” Lois Wilson