Girlfriend wants me to drop my friends?

My girlfriend wants me to drop my two best friends who I've known for 4 years. She says it's because they're "bad friends for me", but they aren't really bad friends and I get the feeling she might be manipulating me or something. She talks crap about both of them constantly, called one of them "mentally disordered" and "autistic" and gave me the ultimatum that if I keep being friends with them I'm "going to lose her." She keeps telling me they're both just jealous of her and that's why they both don't like her (they have told me it's because they think she's a bad person).

I love her but they are my closest friends. I feel controlled by her and have only been going out with her for a year. What to do? Who do I choose? Friend or girlfriend?

Girlfriend wants me to drop my friends?
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