The OM and wife met at work. It was a new job for her. She's only been there 4 months and that's where they met. He left her Hersey kisses in her office and I would guess paying attention to her, etc. and then telling her his situation about his wife, etc.
And I guess that's how the friendship started.
I'm only not insane today because of my wife sleeping over yesterday.
It still hasn't kicked in with our son yet, so so far he seems to be OK right now on the surface though he did say one of the nights he stayed home with me that he missed mom. When I told my wife she was upset he felt that way and she felt bad and hoped I wasn't just telling her to lay a guilt trip