Girl Advice, need help please!?

[Kevlar]

Okay, so there's a girl in my class that I'm with in every class with and she joined my school only this year wheras I've been in it for 2 years. So since the beginning of the year we've became really close. So she used to always start conversations on snapchat + other social media things. She used to always say to me 'We're bestfriends' and I'd be like yeahh... anyway my friends all used to tease me cause they thought she liked me cause she followed me around in school.
But to the problems, about a month ago, she started to say I acted like a dick when I was around one of my bestfriends who is like the most popular guy in my whole year, and she was essentially saying that I shouldnt be friends with him, but I really thought that she has no right to tell me who to be friends with and not to be with, so i kept hanging out with my friends and now she has started calling me a bitch and saying she doesnt like me to my face. So I gove her filthy looks and ignore her in class, and so does she. I find that pretty hard cause we both used to look at eachother and laugh when funny stuff happened in class for so long.. but the annoying thing, is that she is friends with my girlfriend who is in a different school and am afraid what her bitching to my girlfriend will do. She already has bitched about me to her before. Can I please get some advise for what to in this situation?

Some things you should know:
I dont like her
I have a girlfriend that I really like
Idc about the bitchy girl

[ywl2w7]

Maybe the girl secretly likes you. If the girl had no interest in you she wouldn't have cared for what your popular friends said. And if you don't care AT ALL you wouldn't have even bothered to put this question about the bitchy girl for advice. I think you do care as a friend and miss her since you were good friends. And you most likely act differently when your with your guy friends because that's how everyone is. She probably sees that and feels like your not being yourself and that's what she has a problem with. And what kind of friend goes along when another friend teases? Not a very good one. About your girlfriend don't worry if she likes you she won't care about what anyone saids

[Alexandra]

I think that you should now tell you girlfriend on how bitchy that girl is so you get your girlfriend away from her (i know its mean but that's what i would do), btw that girl might actually have a crush on you so keep away from her because your life might just get more complicated.