Ok, so my friends have split into two sides because one side hates this girl because she has a rep for ruining relationships. I've never been in a relationship so it hasn't bothered me even though it's wrong and the other side is the people who don't mind her and the problem is I'm with both sides right now and I don't want to have to pick sides and it's gotten to the point where the one side has told me to go bully and torment her, but I can't do that because that's not me, but the other side is saying that these people have never been my friends but I know that they are wrong. What can I do to resolve this?

How old is everyone?

The half that want to bully this girl are idiots and not your friends if they are pushing you to do that.

They will probably be sweeping floors and emptying trash cans for a living when they get older. You don't need them because it starts there then it gets into worse and worse things and someone gets hurt...or killed and some of them end up in jail at some point.

You have to do what you think is right, no matter what anyone says, or tells you to do. Your true friends will understand, and accept that about you, and respect your decision. The false friend will not.

Drama in friendships/relationships is stupid and a waste of your time. Bullying is not acceptable under any circumstances or to anyone. But I think you knew that already. Your best bet is to stay neutral to both sides and let them work out their drama, which will happen in time. Don't ever allow any other person to bring you down into their negative world.