Wife wants marriage with OM, is there any hope?

[PeterV2]

She then tells me that she told the OM that I played and sang this song for her. She told me that he got very upset and said he hates that song now.

Bravo! Nothing like using music to enrage the savage beast. Brilliant, if inadvertent.
First of all, get off the dating site. It's not doing you any good. It's giving her a reason to justify leaving you. Seems like you have a lot of good things going for you here. But you will still have to deal with her feelings and lack of forgiveness for your infidelity 5 years a go. I would meet that one head on - maybe safer to do with your MC.