Why do women get a kick out of getting even the slightest/most formal kind of attention from a guy who has a girlfriend?

Like it could be simple as him telling another woman goodmorning. That’s just being polite. That doesn’t change the fact he has a girlfriend but let that woman tell it, he’s flirting with her. Or a taken guy holding the door for another woman. They take those gestures to mean more than they really do.

Why do women get a kick out of getting even the slightest/most formal kind of attention from a guy who has a girlfriend?
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