I REALLLLLLLLLLY need help. PLESSSSSEEEEEEE?

ok i like this girl and i liked her last year and she jus wanted 2 stay friends an now she has a boyfriend whos 17 me an her r both 14 and ive kinda ben flirtin wit her and 2day i kinda laid it on a little 2 much.... well alot but any way she used 2 like my bestfriend and he hated her and now he likes her kinda but jus cuz shes hot and i think she likes him a little more than me well prolly not to much but any way she loves her boyfriend alot and i was thinking of asking her out but then i thought of jus bringin up the movie she wants 2 c and say im goin an ask if she wants 2 come wit. wht should i do