Does any1 have any advice?

im in the 10th grade and theres this girl i really like. 3 months ago i told her i liked her and all she said was thts cute. but after tht we started talking a lot more in school and on aim. she usually ims me 1st does tht mean shes thinking of me?but the bad part is tht theres this OTHER guy that after math cl always waits 4 her and she then starts talking 2 him and flirting. so who do u guys think she likes and if u choose the other guy how do i make her like me?