Hmmm.... and QS's post was very insightful! You and I were discussing the prowling/trolling, but I never looked at it completely in this light! It struck home that H doesn't look at anything he's doing as wrong because perhaps there is no specific OP right now. It's the "anyone but Sunny" thing. So, technically, maybe he's not cheating. However, he's getting a rush from attention from OW and wanting to date...and that fantasy person perhaps.
WOW: this is almost harder to combat than just a specific OW. Mainly because if there is technically no A, there's no guilt either. It's just a fantasy mindset where it's blaming me and the marriage for his unhappiness.
I see the only way of dealing with this as showing him the door. There's nothing to expose. Of course, there's always hope that this weekend retreat we are going on will help... But dang, what an epiphany to start the day.