A serious girl problem... plzzz help!!!?

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Theres this girl iv known 4 more than a year now( i m a guy).. we have been besst of friends rite from the beginning...rite now.. we rarely tok 2 each other!! theres like this strange cold war between us.. i dunno y.. Actually she n i were a part of a certain group of friends.. she had a quarrel with them n since then she has been hanging out with other people... but even then there wasnt this difference between us.. but now.. it was jes yesterday when we din even luk at each other.. i have no idea. but even i kudn luk at her... that freedom.. that friedship seems dead! i had taken certain iniatives to break the ice.. i started tokin 2 her once n again... but very rarely does she take the initiative to tok 2 me. i feel so hollow without her.. i hope she'd understand.. i still consider her my best friend.. but she never reciprocates it. please tell me what to do... we r in college 4 the next 3 yrs... n i don wanna lose out on her.. i wanna spend each n every day as a happy one WITH her