I agree, I wouldn't tell her since its not happening now and it will only do harm but if he's cheating now with somebody and you're aware of it then maybe you can find a way for him to come clean? Nobody likes the messenger in this type of situation but if he won't come clean then if I were you I would tell her but she may not believe you and may end up upset with you instead of him. It's a tough call! If I were your friend in this situation I would want to know but who knows how she'll take it.

If it's just past stuff then I say let sleeping dogs lie but if it's current then it's a problem worth addressing.

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