Is my friend fake? Should I drop her.?

I went to my friends party with my friend and when we got there she ditched me for this other girl and barely even talked to me and kept leaving me and being really rude. I m pretty sure that girl was trying to steal her away from me bc every time she tried to talk to me the other girl would cut in and she would stop talking to me and talk to her. Also my friend had just called her a whore like a week ago so what the hell? Plz help.