Why doesn't my man want me having male friends?

Seriously, it's driving me nuts. I'm supposed to block all male friends because "He doesn't date women with male friends, and it's just who he is." If he wanted to have female friends, it wouldn't be a problem. This literally seems sexist as fuck. I'm starting to wonder if he's sexist. Not only that but he does other things that make me really uncomfortable.
Why doesn't my man want me having male friends?
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