Going with the rest on this one. Can you tell yourself, if by Monday I am still feeling crappy about this, I will confront him about it. Give yourself some time to cool off, but also giving you a back up plan and permission then to confront him. And then the iron will be cold. Asking him about it while your emotions are running high is going to do no good (isn't it so easy to be resonable on other people's threads?)
If OW is a needy thing, that is going to get really old. Let her screw up all on her own, keep smiling and think of your lipstick on his face! Maybe get some on his collar next time?
