I've recovered nicely in the last two weeks. I still don't have proof of an affair, but I don't need it. What happened just doesn't matter.
I now have four women that I'm dating (i.e. gone on multiple dates with). One wants a casual relationship and that got physical. Two others I like but don't see as LTR material. OTOH, I've really clicked with the fourth woman. I didn't meet her on an OLD site. She's a friend of a friend. I met her once when I was married, and we had chemistry then. I think she has potential. I'm going to take it slow. Fortunately, my schedule is going to force that to happen. Since I have such strong feelings for her, I should probably stop dating the other women.