Don't name check me and my marriage thanks OP.
My DH is absolutely no contact with the OW, unlike your MM.
If you want to make comparisons, leave him out if it. I'm bloody livid!
You can compare him to my DH's skanky OW if you'd like. Shagging someone else at this year's version of the event they were at last year! And this is allegedly her 4th work place affair we have since discovered.
Your MM sounds as delightful as she is!
My DH couldn't be trying harder to repair the damage his affair caused. And obviously as the affair partner she is still culpable in my eyes, maybe not as much, but I stand by my opinion.
Unlike my DH and your MM, she still continues to behave that way, with no regard for her marriage or her children.
You can justify it with any reason you want, or at least try. You both sound like horrible, selfish people.