Why is she ignoring me now?

My case begins from vacations. I added this girl from my school on Facebook, and started talking with her on facebook. Then i took her Cell no. and started texting. She used to play Basketball with me in school. So bit of talking too. This was before vacation.Now in holidays i started talking with her on phone heavily, and i could tell she was keen to talk with me.She gave me nicknames she nicknamed me Chad Micheal. cos she thinks i look him. She also said good things about my hair and compared with chad. I also gave her nicknamed Anne Hathaway.She liked that. When i asked her no. she graciously gave it to me on Facebook. So we talked alot on phone... till the vacations ended.. and college started again. Then, all of the sudden, she started ignoring me. She didn't even reply to my messages on phone.. when school started. However it could be cos, i didn't meet her yet. I think shes doing that.. cos i haven't met her...as she was expecting me to meet her.On facebook she stopped replying too. There this guy from my cl, hes jealous of me and he talks with this girl live alot, and on net also. He act very rudely with me. But hes nice to others. I reckon that this guy is making girl against me.When both talking, they stare at me aswell girls friends too. What should i do?