What will/won't you tolerate in a close friend?

I knew both him and his wife. She always seemed a very nice person. They had 2 kids and she put on a few pounds in the process. He decided to start screwing a much younger coworker of his, leading to the 1st couple getting divorced, and the second married. I woulda had no real objection if it had all taken place in a different order.

Hell, I don’t care how your feelings change towards your SO. Just split up/divorce - then get on with whatever you want.

Agreed, and I’m actually still friends with my sister’s second husband, even though they are going through a divorce right now. (A more amicable one than the first.)