Sacrifice for love ?

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I'm in love with a girl in my school for 3 years ! Though she doesn't see me as a boyfriend but a normal friend,i always keeps her image in my mind. I understand that i'm not the one who bring her happiness. But what should i do ?? I want her to be happy with the one she loves, but it hurts so much to see your dream girl go with another guy !!! I wonder if there was anyone in the world could really stand seeing the love of your life being happy with another ?