what wud u do if ur best fren's spouse is having extra maritail affair?

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If u found out that ur best friends husband is having an extra maritail affair with a collegue at work place what would u do? would u tell ur friend? would u tell her husband thats its wrong? would u tell ur freinds husband's girl fren that he is a married man and that she should leave thier family alone. My freind has two children and has no clue that her husband is cheating on her.What do u think is the right approach to this problem. Please share