Why would he say we're just friends but then get mad when I talked to other men?

Anonymous
i been friends with this guy since may we hit it really well we started hanging out meeting each other families I end up catching feelings for him but he always say we're just friend but when I talk to other men go out with them he gets mad at me saying he knew he wasn't good enough for me that he can't make me happy I don't understand him why would he care what I do if we're just friends?
Why would he say we're just friends but then get mad when I talked to other men?
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