Why Would A Guy Never Mention His Girlfriend?

I've had guy friends NEVER mention their girlfriends. Like EVER! And I am not talking about guys who are private. For example, a friend of mine went to vegas with his girlfriend. When he got back and we asked how it went, he literally talked about about everything, except his girlfriend. 5 day trip and not one mention of her. Why do guys do this?

Why Would A Guy Never Mention His Girlfriend?
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