My story is on my page. I have ended up finding out about 3 affairs aside from my wife's. I will say those affairs were generally "worse" than my WW's, and they contributed to her minimizing. The normalization of cheating is a big risk factor for cheating.
I also recently found out my best friend was cheating on his wife, which isn't a huge surprise since he had a history of cheating before marriage (that his wife was aware of before they got married), but still really disappointing. He thought I might want to cut him out of my life based on my experience and stance on infidelity. I said something like, "If I cut everyone out of my life that cheated or condoned cheating, I'd be out of people." Well, I'm sure some folks here would argue that exactly what I ought to do, but it isn't.
Before I got cheated on, several of my friends were prolific cheaters or otherwise just kinda dirtbags, which isn't "unusual" overall. I was, and am, able to realize that just being dirtbags as it relates to fidelity and sex doesn't mean the person is otherwise bad to have in my life in some way. That said, I will no longer stand by idly if I'm in possession of knowledge about an A. If you go back and do a search you can see me talk about this to some degree in a few threads where my wife tried to derogatorily call me "Captain Infidelity" as I revealed those three affairs, but I just kind of like the title now. If it is vaguely my business, I'll tell the BS.
So the idea that I might want to engage in anything vaguely close to work gossip about an A, without actually revealing that A to the BS is extremely unlikely. I would either be so detached from the person that I wouldn't care to talk about it, or I would do something about it.
Likewise, if my wife were to bother bringing up an A to me, she knows the first question I'm going to ask is something like "How well do you know this person? Does their spouse know? (etc.)" and for that reason, if it really was "none of her business" she wouldn't bother telling me about it. It would be like telling someone you know is a police officer that you saw a stabbing, then said, "Well I don't want to get involved as a witness, I just thought it was an interesting story."