And really sometimes guys just don't get it. That's why the majority of us are here.
Honestly, I don't think you're the type of gal that can hold it in. So I would ASK him about her. Not accuse or yell or confront. But talk to him about it.
Just tell him you want to set your mind at ease and wanted to know if he had been in contact with the OW. Kind of give him the benefit of the doubt sort of thing.
If you go in with all guns blazing he's going to backpedal, get all frazzled and not know which way is up.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.