Im in love and i really need help on what to do?

my eyes were first set on a girl when i was in year 9, it has been 3 years since and a year ago i thought she had realised i liked her. because i use to give her all them swwet mages and her replies use to be like "awww thats sweet" i thought she had a little feelling for me and alos she use to call me "hun" and "babe". that was a year ago. once i got her angry only by syaing if you were with me ill treat you like a real pwincess and she me made loook like a despo and facebook saying that im desperate and shell never bee wiv me even if i was the last person on earth. that really hurt me inside and i dindt know what to do so i though ill move on. from then on it killed me day and night. this was a year ago. now about a couple of days ago i told her at a party there were too many people around i just said i love you and she replied why and we got interupted and she went away but looked back probly expected me to follow but i went another way. i told her messaged her and told her that what i said on the party i really ment it and she laughed and she said why suddenly and i replied saying its not out of the blue i loved you since year 9 for 3 years now and i cant stopp..she put a expression on the "i cant look" and i told her ill stop if u dont want me to express she said i dont want you to express.. i got my freind to ask her and she told him that she had no feelings for my only as a mate.but i want to be her sould mate. and all this time she told me she didnt want to be in a relationship and she also lied saying she was taken.why did she do that. why didnt she ust come clean and tell me what she really though. will i be able to ever make love with her. make her love me. will she ever love me. will i have a chance in the future.. im really heart broken and cant sleep i wake up in the morning saying her name :(.. this is the worse i have felt in my entire life believe me . i seriously dont know what to do . all i want is herr i want her to be my partner. i didnt go out with anyone just because i was waiting for her :(