I kept quiet.

I actually ran into my friend's husband, (he happens to be my cousin), while he was sailing with another woman. Panic was all over his face. He was so afraid I would say something, he told his wife himself. She called the next day and asked me about it. lol. So it took care of itself.

In this case the wife knew her man cheats. They have worked it out, though,...and I'm still the good guy.
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As soon as you trust yourself, you will know how to live.
Goethe