Frenemies?

I have a crush on this boy and every since i showed my best friend who it is she's been screenshotting his pictures and sending them to me calling him fine and sexy and saying things like "she's going to steal him from me" this is not a one time thing she has done this more than once she also gets jealous of me sometimes for no reason at school this boy has a crush on me and i guess she likes him but he's always flirting with me i dont like him so i always push him away and she'll get mad and start talking about me honestly im starting not to like her and she's starting to become a bad friend..