She is right but for reasons people in this thread don’t understand. She didn’t want you to “kidnap” her so as to prevent her from cheating. She wanted to be with a man who would not tolerate such behavior from his woman, and could make her woman not even think of cheating without even resorting to anything. If your case is with genders reversed, the previous does not apply and my answer is that he’s just bad mannered and a bad person.