Girl friend problem please help..?

I proposed to this girl finally with guts after 18 months since i'm in love with her....she is my classmate... she did not accept me...she removed me from her friendlist and blocked me in facebook. My college life is ending in 2 months from now. I'm dejected.. and i'm 200% sure that this girl is still single.. How can i win her love...I dont want to miss her in my life...suggest me what can i do next...she have told me that i'm a great friend of hers...but i never expected she will cut my relationship in just 1 day...Help me...