I don't know if this belongs here and it does not really relate to categories
here but I'm puzzled and need help.

Two years ago, I went to work in the sales office of a large company, I'm just one of a handful of women and most of the others are men. In time, I have made a few good friends and one of them is a terrifically nice guy who would not hurt a flea.

In time, I found out that my friend's wife has fucked and been fucking nearly every man in the office and they continue to do it. Once, she was doing it right in the office supply room with one of the salesmen while her husband was out making sales calls. I was astounded by this woman's lack of character and disloyalty to a truly nice man. We all knew about it while it was happening.

My problem, I am tempted to tell my friend what is going on with his wife but I'm kept from doing it by fear and all the chaos and pain that might result.

I'd like to hear other's opinions and advice, please.