Why do guys love to talk about their money?

I've noticed over the years that guys love to talk about their money. How much they make, spend, or save. I have noticed this behavior in my current boyfriend but I have noticed it from past relationships as well. I personally don't like to discuss my income, I find it unnecessary and kind of a turnoff. Can someone give me some insight as to why guys do this?
Why do guys love to talk about their money?
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