I am really sorry you are at this point. I have so been there. I honestly think your exW has OM. You just need to move on with your life. You really should be with a woman who holds her commitments sacred; your exW obviously does not do that. I know this is easier said than done.
I thought I really loved my exW for the 15 years we were together. It turned out she was not the woman I thought she was. The was the toughest aspect for me to handle.
Take Care,
NMD
"Chains do not hold a marriage together. It is threads, hundreds of tiny threads which sew people together through the years. That is what makes a marriage last --more than passion or even sex!" - Simone Signoret