Why do men brag about stuff?

I know this one guy, and we stopped talking for a long time. We started talking again recently and he's been bragging about his parents' jobs, his girlfriend's job and saying that he was called into a leadership role in one of his interests. He never used to brag like this about himself.

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3 mo
All the things he's said are exaggerated or lies.
Why do men brag about stuff?
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