Why is this girl such a bitch to me?

Anonymous
There's this girl I've known for about 3 years, who's sort of friends with my GF. It seems every time we meet, unprovoked, she'll insult me and call me names. The last time this happened was on a night out with friends. She pretty much gave me lip when I had done absolutly nothing. I told my GF, and this other girl who asked if I had a problem with her, to which I said no.

Why is she so horrible with me? Why does she want to start arguments/fights?
Updates
+1 y
I also remember a moment inside the club when she came over, drunk, and asked me what my "problem" with her was.
Why is this girl such a bitch to me?
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