I'd be more inclined to think he *may* have OW in his sites than a one-night stand. He thinks you are hating him (yes) and mad at him (yes again) and doesn't see any reason to think differently.(you haven't given him one yet)
But even IF there is an OW, what sort of person gets involved with a clearly depressed, not-yet-divorced guy? Nothing of merit.
I don't know why, I thought you two were a bit younger--but still--humiliating.
And alone with his thoughts, even though mom says he is "perfect", I bet he doesn't believe her. Sure, it's nice to hear, but being perfect isn't what gets you into marriage problems.
His thoughts are not as clear-cut as you make them. Or he is a psychopath and you haven't described him to everyone here correctly.
Which is it? a guy with a clear, calculated plan to do you in?
Or a basically decent person that has made some extremely unfortunate (ok, bad) choices lately?
