Replying to God damn girls

alright so...
i was best friends with this girl for like 2 years, and then i went to highschool and she was still in middle school so we kind of stopped hanging out. then this year she comes to the highschool and we start hanging out again. and she has gotten very attractive. so i start to like her and i tell her and shes like whatever, she didnt really say anything. i guess its kind of weird because we have been friends for so long.
Then we start hanging out with this chick who just moved here, shes hot as hell, nicest ass ive ever seen. today she tells me that she wants me. the only problem is that one of my best friends was trying to do her last weekend, and i think he still wants her. but she dosent like him. (i sound like a 6th grader)
so, if i get with this new chick, then my chances with the other girl are gone, but im with a really beautiful girl, but one of my friends might be a little pissed off. if i dont get with her, and try to get with the girl who has been my friend for a long time then, i lose the chances of the new chick, and she might even not be digging me.
what the fuck do i do?