best friend and boyfriend problems

ima make this short so it easier ... my best friend hates my boyfriend and she makes me feel like shit for being with him even tho he treats me like i’m the most amazing person he’s ever met. he treats me right and she tells me shit for it and i don’t know what to do. anytime he isn’t around she and i are great and we laugh and we r like best friends should be but then he’ll show up and she’ll either be a bitch to me or just straight up ignore me. i can’t keep going through it and when i talked to her about it she says she’s just “looking out for me” and she doesn’t listen to me when i say he’s a good guy. none of my other friends have a problem with him and i don’t know if i should cut her out or what. people say never chose a guy over a friend but i don’t know ...