I would stay out of it. I base my suggestion on experience. My best friend from school days and beyond was cheating on his wife who also happened to be friends with the Mrs. and I. I tried to talk sense to him, tried to convince him that he had a family (2 kids) he was responsible for, blah, blah. Said some things about who he was stepping out with that I regret now, but I felt strongly I was trying to save their marriage. I was naive. Basically, it ruined our friendship. Things aren't just the same and it has been years since we have gotten together.
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