best friend...

hailey
I'm not really sure where to post this, I thought this may be the best tab to open up about this due to it being "lifestyle" and all. My story is really long, but I am going to give a somewhat shortened version of it.
My best friend and I were running in a six year friendship. Everything during those sixish years was pretty good, we were very close and told each other everything. Yet the one problem is that we both wouldn't speak up for ourselves, both of us being very shy. That also meant that we wouldn't get into fights. The biggest "fight" we had was when we both ignored each other for a few days because we both knew something was wrong but didn't want to say anything about it. This past winter something happened, I am not sure what happened but something did. One day one of the girls in my friend group decided that she didn't want to be friends with me anymore so she stopped talking to me. I was very confused and I was very hurt, I tried asking my best friend what happened and I would never get an answer. Then just a few weeks later another friend just started to ignore me, she would still be around me but she would ignore me. Then all of the sudden my best friend started ignoring me too. This went on for a good three months before I said anything to her about it because I was so afraid of hearing something that was going to hurt me. I asked what was going on and she said that nothing was going on and that we are still the best of friends. While everything was going on I still stood with them every morning before school started and I still waited for them to walk to the bus lot. I stood there and waited to be talked to again. After the talk with my best friend I was hopeful for a change. No change happened. I was spiraling down a dark path and I needed help. I needed someone to pull me out of the dark hole I dug myself. She wasn't there. The girl I used to come with for everything wasn't there anymore. I would tell her what I was thinking and then she would say it was nothing. She would say that her problems were worse. In this day and age everyone has problems but that does not give you the right to say my problems were nothing compared to yours. So I sat there and listened to your "problems", mind you it was all about how she doesn't get everything she wants in life. One day there was something inside me that clicked. I wanted a better life, hell I needed a better life. I couldn't keep letting myself reach out to someone that wasn't there. I need to think on my own and find my own way out of my dark hole. That day I cut the thin rope holding us together as "best friends". That rope did nothing other than make us be partners in class when the teacher assigned a group project. That small thin rope just dangled there in my dark hole. I kept pulling on it to get a response but I got none. Now that that rope was gone the deep dark hole that I put myself in didn't seem so deep and dark anymore. I still needed help, but not as much as I thought. I was able to call out to new people for help. They gave me a rope and then they stood at the top as they hoisted me out of the hole.
What I am trying to tell, the reason why I'm posting this is to help others but also because I need some advice.
How do you just get over something, over someone, that was such a huge part of who you are today? How am I supposed to live knowing what I did to her was exactly what her and countless others did to me? I hated it, I hated myself because others just stopped talking to me. Yet I did the same terrible thing to her. I know what I did was the best for me, yet why do I feel so bad about it? All breakups, best friend and boy/girlfriend alike, are awful and I just need some way to cope with it. So some advice would be greatly appreciated.
If you just read this just to read this I hope you have a fantastic day and that you stay strong with whatever you have going on in your life. 
Thank you.