I think I'm going to cut off a friend for the sake of my girlfriend
Why would you cut a friend off for the sake of your girlfriend?
My girlfriend doesnt want certain people in my life.
Your gf is controlling your life too much. She should not have say in who your friends should be. It will be very hurtful to your friend is you cut him off for your gf.
she worries way too much
I do think she's worrying too much, and you should tell her that. There's nothing wrong with having friends while being in a relationship.