Please help? Should I be her friend or not?

There is this girl and I saw her before in my sister's ballet concerts but never talked to her. So when I saw her on facebook I requested her and started talking to her. Then I thought of seeing her. She refused and said she was always busy.As I kept asking her and she kept answering me the same answer, I got mad and kind of started the fight. She just continued it and now for about 2 months it's continuing :( Yesterday on the internet she told me to leave her alone and she doesn't want to be my friend anymore ! I deleted her 3 times on facebook (as a friend) and then in the end I said I'm sorry and I wrote about a one page letter. She didn't give me any chance this time and just blocked me. She never answers my phone calls so I leave long, meaningful messages to her. Today I saw her in the Nutcracker and as I tried to start the conversation saying hi emily... you danced really good you know? She just, without looking at me, said hi and headed toward her friends talking and laughing with them, making sure I see her. I looked at her and felt like such a loner and idiot, I think this is the end of the world. I'm crying hard now, crying like every bone inside me is broken and my heart is cold, full of bad stuff. I want to explain to her, this is all useless and stupid! A fight isn't a fight unless it has been done face-to-face. If people meet each other on the internet, they end up enemies. That is always true! I want to start all over, correct my mistakes and be happy again. I want to be her friend so bad.. I feel like I'm gonna have my insides torn in any second of impatience. I want to call her, but I know she won't answer. What should I do? I Need Help Now.