Bless your heart. This truly wasn't fair, but it seems to happen so often. These men have their "mid-life crises" and go out and find some young bimbo and think that makes THEM young again! Contrary to that belief, they're still the same age they were when they left you!
Dearheart, you are NOT ugly, you are NOT unworthy, and you are NOT old!!! You are a desirable, beautiful, and very worthy woman and don't let this drag you down to HIS level! Good heavens, you have plenty of years left to have a wonderful life with someone else! I was married for 26 years to an emotionally abusive and controlling man, and got divorced finally and after 8 years married a wonderful loving man!!! So there ARE men out there, and YOU can just as easily find one too!!!
Don't keep thinking about "him" and that bimbo he married.

Chances are it won't last anyway. You need to focus on YOU. Get out among people, go out with friends, meet NEW friends.

Start a new life. This is YOUR time now.
If you find you're having too much trouble letting go of the past, then please see a therapist, okay? Your medical doctor can refer you to a good one. He'll know who you should see. I wish you the very best. God bless and please take care. Hugs, Lee