How do you deal with this kind of ex-wife?

I was married for twelve years (together almost 20). We had a hell of a roller coaster relationship. It ended last year. I have really been trying to cope with all the change. My ex was a spend thrift who blew a lot of money. When things were in financial ruins she decided it was time to go. She found a new man in record time and being replaced so quickly felt like a real slap in the face to me. The thing is she is once again living high on the hog (He has money). Meanwhile, I am struggling to make ends meet. I am glad she is gone, but it tears me up that she gets to continue her life in the lap of luxury. She was hell to live with and spent money like it grew on trees. She was never responsible and now gets to continue living well. By well I mean an ocean front home, three boats, a home in the Tennesse hills, etc. I know life isn't fair, but how do I cope? I am in a little condo, one car, and no money really. I worry everyday about making it. I guess I need therapy, huh?