Friends Dilemma

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My neighbor and I have been friends for a number of years. Recently he told me that his sister-in-law was making advances towards him when his wife was out of town. She is recently a widow and they had dated before he and his wife were married. He has a good relationship with his wife and says he is happily married. He asked me Should he tell his wife? I told him NOT to tell her and to tell his sister-in-law to he is NOT interested. AND if she continues to persist and try to visit him when his wife is away, he SHOULD tell her. What do you think?