@ehBeth,
I completely agree. I wish more than anyone else I could be open about this. But what would my wife prefer? To be in the dark, and to stay in our marriage, which I think is healthy, at least healthier than average? Or to find out the truth, and probably get a divorce and have everything come crashing down?
I would love nothing more than to be able to tell my wife "look, I have this desire, and you don't want to help me with it, so I'm gonna go get it satisfied somewhere else, but I still only love you". But my wife wouldn't understand that. Heck, she honestly tells me that looking at porn and masturbating is cheating on her. It's just not gonna happen. I honestly think she's happier not knowing. How can you possibly claim differently?
The other girl is different. I honestly think she doesn't want a relationship, she really just wants to be friends. (It was on "that" dating site where dating really isn't the goal). I could see the possibility of her being "better off" knowing, but is she? Would she like to know that she slept with a married man? Or is ignorance bliss here too?