Want to be happy

I am 21 year old,doing graduation in INDIA. well... coming to the point.. when i was 18 thats starting of my graduation.. I fell in love with my classmate.. Ofcourse every one will say that their girl is the most beautiful in world, me too..then i started staring at the girl even when classes are going.. she knows that i am looking over her all the days.. some times she too looks at me.. i thought she is also having interest about me.well months passed very happy... then my friends came to know that i am in love and the girl iam loving, they started teasing me and my girl.. at last all the class came to know.. even friends of my girl started teasing her.. then she was angry at me.. she made a call to my friend and said to him that i should not love her any more.. even though i continued then after days.. i call her she was angry and shouted me...
but in the classes the chemistry between us was perfect. we can study each others mind without taking.... its about signals between us... but when i start taking her she again shouts on me... this happen for 1 and half year....
finally i understood that she was not in love with me.... when she was not in love with me then why she did smiling at me, giving responses for me when i give any signal to her...
i didnot have felt sad for all this.. but she never treat me as a friend even though we were batch mates for 3 years... she never takes to me even when i started.... even though lots of tears for her i enjoyed it.. what ever it may be she never wants me.......when i came to know all this... i thought i have to forget her .. i am doing almost but in accidental when i look at her eyes its all going to begin again.... i donot want to begin all this... i just want to forget her....take her off my mind... please help me....