Does love fades so easily?????

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I had been into a relation with a classmate of mine since I was in 11th. Now It has been more than seven years. Few months back in October 2006 we had a fight. I tried to convince but she didn't understand. And only after two months, she is married now. I just am not able to forget her. What should I do. Is that so easy to have a relation for so long and she not remembering me. Now if I ever want to even talk to her, she doesn't.