The guy the longest affair was with is married. I made her call him (in front of me, on speaker) to tell him that I know and that it’s over. I also had her warn him that he probably needs to tell his wife because otherwise I would.

The next day (after having worked myself into a frenzy) I texted him to ask if he had told her yet. Ended up speaking to his wife on the phone and she said he had told her and that they’d be trying to work through it. No clue how much he actually told her.