Someone hitting on you spouse.

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What would you consider clues that someone is hitting on your spouse? What if the person doing the flirting were a family member who you trusted, what would it take to make you think they were up to something? I have reasons for asking this. It is not my husband being hit on. It is someone in my family, who I am trying to get them to open their eyes to the fact that someone whom they trust is taking advantage of that trust.