Forget the woman. She's chosen to move on (probably realized you weren't leaving your wife and she deserved better).
Explore leaving your wife. It's just my opinion, but you'll **** up your kids more by staying in that marriage than otherwise. And she definitely deserves better.
Get your priorities un-****ed up.
"And I don't wish that girl any bad luck," he said, "but I hope she gets hit with a car."
- Tommy Lasorda