Messages from Girls

My husband got a FB message from a girl about his high school reunion asking if he was going and that she missed him.  Granted that's harmless but he told me about it saying a committee was FB messaging people about it.  My issue - He's been in trouble before messaging girls and he knows better but kept doing it.  To the point where it crossed the line.  Am I being too sensitive to ask that he should of just told me it was a girl FB messaging about their HS reunion?

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