Is It Really Worth It????

im a guy, 15 , and my best friend is a girl. i have been in love with her forevr. we really started being great friends 1.5 yrs ago. i have told her i love her as more then a friend and she says she loves me as only a friend. in da beginning of the school yr things were great and we talked evr nite. we watched tv while talkin on da phone and walked together between cl. then when swimming season(she a swimmer)started she talked to me less and got a boyfriend on the team. i still loved her. i asked her y she didnt talk to me much and she said it was cuz of swimming. a week ago she was dumped, and called me crying. we talked and i was there for her. we talked a little more. i have gone to all her home swim meets to support her n show her i love her. yet she nvr really says thx for coming. lately she walks with the swim guys and doesnt really notice im there. i love her with all my heart n think of her all the time. i have thought of suicide bcuz im so depressed over her. what do i do!!