Good Friend Gone Bad

okay this is long, but i want your opinion…

a while ago my best friend met another girl and they became fast friends. since then that girl who shall remain nameless has been turning my best friend into a nightmare. she used to be really cool and we could laugh about stuff and talk about our problems, you know … girl stuff. anyways now all she wants to do is talk about herself and her problems. for instance, today i had to sit in the library and watch her shop for bathing suits online + she is always bragging to me about how her other friend is always out with guys and how she is going to set her up with another guy who she met once while he was driving her home … high on drugs going about 60 miles per hour according to her. she’s also become so self-centered. today another one of my friends was telling me how she got her heart broken from a boy who told her he couldn’t take her to the prom. when i told my bf she said “well i can see why he didn’t take her.” as if to say she’s to ugly to be asked. i felt so bad for my other friend because she is beatiful but quiet, but because shes not popular and a druggy she is labled as “unfit” for this other guy.

sorry i know this is long but i don’t know what to do with my bf. shes turning into a monster.