Need help with this girl?

so there's this girl that im crazy about. ive had a crush on her for the last 2 yeras. the first year i didnt do anything cuz she had a boyfriend but they broke up. so for about a year now ive been tryin to get with her. she knows i like her we hooked up and we always have a blast when he hang out. there's never any dull or akward moments. i really adore this girl...i always listen to her stories, do my best to support basically everything a good boyfriend should do i even talk to her b4 she goes to bed and sometimes she texts me at night if she cant sleep but for some reason she doesnt want to commit to me and i have no idea why. its startin to hurt me now everytime we hang out cuz i hate knowin she is just a friend. any advice on how i can win this girl over or does anyone think this girl is just repeately teasing me. from what i heard she is hookin up with other guys too so maybe she just wnats to be single cuz she broke up with her ex a year ago and doesnt want a relationship. when i try to talk about it to her she just changes topic. any advice would be great cuz like i said im basically in love with this girl and id do anything to get with her