I really don't deserve that. I seem to remember your name from other threads. Hmm.
I happen to know a man, who I speak to regularly on FB. I have know him, and his wife for over thirty years. His wife had an affair last year, and I can see exactly why she did. And now he is very hurt, and posts about it a lot on FB. There is no way in the world that my talking to him about all this means that I am on the verge of having an affair with him!
He also had an emotional affair with someone he works with.
He talks to LOTS and lots of people, and is quite open about his personal stuff...some people are.
As it turns out, they are going to stay together, and I expect one of them will dabble again at some point. They both come from highly dysfunctional families, and they love each other very much, and there's nowt so queer as folk.
I don't know of anyone, happily married, who had an affair, simply because they could, but maybe that's perhaps more to do with the company I choose to keep.