Multiple people have said my girlfriend is bad news. What should I believe?

Multiple people have told me that my girlfriend has bullied or upset them. But when I ask her about it, she starts crying or gets angry and insists that they are targeting her for no reason or out of jealousy and wanting to break us up. She then asks me to protect her from them, which I do.

I've had her ex-friends tell me she made them cry after saying "mean" things to them and "bullied" them, and my best mate (a dude) said he thinks she's a horrible person and he thinks she's manipulative. My other best friend told me he thinks she's no good. But when I asked my girlfriend, she told me that if I don't protect her from them and take her side, she's going to leave me. She then convinces me that she has done nothing wrong.

What should I do if I'm always caught in the middle? Could they just be trying to stir stuff up between me and my girlfriend or is she lying? I don't want to be with a girl who isn't nice to other people but on the other hand I can't imagine her "bullying" people. I feel like I constantly have to choose between her and people.

Multiple people have said my girlfriend is bad news. What should I believe?
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