How do I let go?

I posted this under general entries but I think it fits better here, so here goes...

My best friend cut me off, blocked me on everything without saying a word. She said she would never just stop talking to me, and then she did, just a few days after she told me I was her best friend. I dont know what to do. I felt like the friendship was over a long time ago, she was never willing to make plans to hang out in person and often got mad at me for trying to talk to her too much, but she expected me to always be there for her... she made so many promises that she just couldnt keep, like saying that she was always there for me and she would never do anything to hurt me, even though she hurt me all the time and then blamed me for it, and would get angry at me for asking her to be there for me. Its been a constant back and forth between the best friendship Ive ever had and one of the most painful. The thing is Id never been that close with anyone in my life and this has torn me up. Its been a month since she last talked to me and I tried everything to get her back but she hasnt said a word. I know I need to let go. I want to move on with my life and start new but I dont know how to let go of the friendship or the pain. I dont know what to do...