Girlfriend hangs out with guy friend that likes her and hates me

Anonymous
My girlfriend has a guy friend that hates me for the simple reason of being her boyfriend. I have NEVER MET HIM lol ! He has admitted to having feelings for her but she still hangs out with him which pisses me off. Am I right to be upset and expect her not to be friends with him ?
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they went out when they were 13 she assures it was nothing serious and I believe her. She then moved and he got jealous for every boyfriend she had after him. when she moved back he put 'extra' effort into their friendship and she had suspicion he liked her
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a few months back he admitted to liking her for all those years shed left and even now he still does and then told her that's why he hates me. I know she wouldn't be with him but why would she keep a friend like that ?
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p.s. he gets more jealous then me when she clubs lol
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oh and we have been together for 6months
Girlfriend hangs out with guy friend that likes her and hates me
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