I don’t think she has the same relationship goals for this relationship that you do. That’s why I think you need to move on and find someone who wants what you want — which sounds like either marriage or at the very least, a committed, monogamous, long-term relationship. She doesn’t want that with you. Obviously, friend zoning yourself is a bad idea. You’re never going to be okay hearing about her dating other guys. So a clean break is best.
For future, understand that if you leave your wife for a woman — who doesn’t want to commit to a relationship with you after this grand gesture, she probably never will. 😕 She may have gotten some pleasure out of your being unavailable and once you became available, you lost your attraction in her eyes. I could be wrong here, but it really sounds like she’s got a different goal in mind for herself than what you’ve got for yourself.
It will hurt to break up, but you’ll be much better off with someone who has similar goals. 😉