How do I get over losing a close friend?

This happened over a year ago, and I still can't get over it.

Let me make this perfectly clear right now, I was the reason the friendship ended. I hurt her feelings very badly because I was incredibly selfish and stupid and I didn't realize what I did. She has every single right to hate me and I do not have a right to complain.

I'm asking for help, because I feel guilty. She wants nothing to do with me, yet she tells me that she doesn't hate me or hold a grudge against me. That doesn't help with my feelings of guilt.

How do I cope with this guilt? I keep having dreams about her and I still wish more than anything to be back into her life. I keep wishing I was a part of her life and I keep wishing she missed me as much as I miss her, but she doesn't. And I'm having trouble coping with this.

Just, please, someone tell me how I can make myself get over this? It's been a year and I can't stop thinking about her. She was my best friend for a few years. I can't forgive myself and I can't move on and I just need help. Please.