My best friend isn't quite divorced yet but he and his wife are separated. I helped him move out. He asked me to stay later that night because he was depressed about everything that happened that day. I said I had to work early and left. I went to his old house, parked a few streets over, and visited his wife. We had never shared our feeling with each other. I helped her make dinner and clean up some of the mess from the move. We ended up going at it on the couch. He called while we were having s**. She texted him back afterwards and said she'd talk to him the next day. I ended up staying the night. Was weird staring up at the ceiling in their bedroom -- same ceiling he had looked at just the night before. I thought about that when she was on top.
I admit it was wrong. We met once more a few days later but I haven't seen her since.