There's a new girl who recently started at my college. She doesn't have many friends, so she's been hanging out with me and she's easy to talk to, so we've been having some great conversations.

On Friday she called me and was really upset about some argument she had with my girlfriend. Basically, she was told to stay away from me.

I asked my girlfriend about this, but she said that the girl is crazy and making up stuff. I'm not sure who's telling the truth, but I don't want this to escalate. My gf said she would fight her if she continues to lie, so things might get out of hand.

How should I diffuse the situation?
@ReapeR, I've been with my girlfriend for just over a year. She's not really the type to start fights and bitch about other girls. Yes, she does get jelous sometimes. The new girl doesn't really seem to flirt..ok maybe a little bit. Is she hotter than my girlfriend?? Well, I would say no, but she's still pretty.