I think you're like a guy who paid too much for a stock at this point. You have SO much invested here, not only in past marital history but now recently with all the HARD WORK you have done. I get it. The forgiveness, the patience. And you don't want to give up when you might be THIS CLOSE to a breakthrough.
You've got to trust the work you've put in here brother, and that some of it will STICK.
I'm not telling you to GIVE UP. I'm telling you to LET GO. Let go of the outcome. Trust God, and trust all the fine work you've done. If she wants the marriage, SHE is going to have to make that choice.