Why are some guys rude to every girl apart from their girlfriend?

Anonymous

I understand someone being uninterested in everyone apart from their partner, but why are some men extremely rude to every other woman, and are extremely defensive over their relationship?

Eg. This guy I know calls other girls “ugly” and “sluts” to their faces in front of his girlfriend. He goes above and beyond to insult other girls when she’s around. Why?

Why are some guys rude to every girl apart from their girlfriend?
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