Holy fuck where do I begin?

I am in need of some serious recalibration for my ex-girlfriend. This is one of those things where most of you are probably going to say it's better to just walk away because this ain't salvageable.

Met her over a year and a half ago. Shared same social circle, my best friend at the time picked on her. I did not know why perhaps he felt threatened by me spending so much time with her instead of him. She complained to me about it and I was blinded by my friendship to my best friend and didn't really take heed. Perhaps that's why she was really indecisive about me in our relationship.

Fast forward to half a year ago, my ex-best friend was completely replacing everyone in our social circle. He would shit talk on our old friends in front of our new ones. I was still blinded by our friendship and it was around this time that his new friends started hating my ex-girlfriend because of all the shit talking from my ex-best friend. She blames that she got so much drama because she got with me.

Two months ago I finally put my foot down and things ended pretty badly between me and my ex-best friend. I didn't fight for any of our new friends, I let him have them. I decided having my girlfriend was enough until I graduate from my university in June.

Towards the end of my friendship with my ex-best friend I felt I was at the most "powerful", being able to connect with two social groups at the same time. It was around this time me and my ex-girlfriend had a rough patch and we broke up. I slept in the same bed with a girl that was in my new social circle, I felt that it might be a good idea to get my ex jealous for being so indecisive with me. It worked, she got back with me and I broke things with the new girl. But the new girl started befriending my ex and telling her all the things I tell her when I seduced her. I tell my ex this but she thinks I was just playing her.

In short, my ex now blames me for every social drama she faced (ie. being hated on by my ex-best friend's new friends). She blames me for not defending her when everyone knew better to talk about her in front of me when I was still friends with them because they knew I was with her. Then, she thinks I'm a untrustworthy douche for cheating on her even though we were technically broken up. The funniest thing is that she does not seem to realize that when she confronted me about picking the new girl or her, I picked her without hesitation and to her that counts for nothing.

Anyways, I tried so many ways to recalibrate her frame of mind but shit, I'm just so low in her mind she just doesn't trust anything that I say. And out of all this shit, I lose my best friend, friends from both social circle and now her as well. Yeah, I admit I'm not the perfect person...I should have protected her more but I did care about her and I did choose her over the new girl, but she doesn't seem to get that at all.

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Become your own man, stop waiting for the sky to shit out gold.