Try if you can help me out of this situation?

okay.. To start with.. I am a guy who is mad over a girl.. I love that girl crazily. That girl knows it very well. In the first place she said we can be friends. Some days later we started to come closer. We became best friends but i never stopped loving her. We went through a lot of misunderstandings mainly because of my liking thing. But she was always mature enough to hold on. But some weeks before, she suddenly told me that i m no longer her friend. She doesnt want to get with me. She said that we can be normal 'hi-bye' friends. But its very hard to be normal with a person who was once your best friend. She doesnt even care whatever i do. so now here i m.. I dont know what to do. Too messed up. And very depressed..