I've cheated as well. The advantage is that she's still there, give her time - she decided to stay, her choice, if she was really that unhappy - believe me, she would not stay.
It's hard to figure that someone that young would have anything in common with the old geezer. Definitely sounds like the father figure attachment.
I also loved my H while I was with the Om. My A stopped when I told him (upon request).
She's sounds like she's going through withdrawal pains. If she keeps telling you those things you don't want to hear...tell her so - tell her to keep them to herself.
Good luck
P.S. Sometimes people don't always understand each other's sitchs, nor really read them, so you need to absorb what actually applies to your personal sitch and go from there...everyone has a similiar sitch, but the X factor is the S. There are a few I just ignore.....good luck!