Breaking up with my best friend my experience

Ik this is fucking long but it’s more for me and I have been so pussy because I’ve been complaining about it to everyone I fucking know and this damn website for the last 6 months, so I am divorced now and changed my name
It’s finally boiled over, Ik people here also use relationship issues I hope if you’re feeling unsure this helps you

I was a little delusional about my best friend, we’ve been besties for js about 10 years we used to be very close did everything together we even had shared emails, shared accts, crazy shit like that, she even introduced me to this website
but these days I came to the hard conclusion that it’s very one sided, I’ve been used as a scapegoat even used going to my concerts as an excuse to hangout with men when she’s never been to a concert of mine before , and I’m only her friend when I am convient to her, found out she talks bad behind my back , I shouldn’t have put in as much effort but I did and it never got better.

I wrote a very heartfelt message to part ways, it was almost everything I wanted to say, tried to convey my issues in the most mature way possible. Was willing to work on the friendship if communication became more mutual.
she took a couple of days to read it, finally read it and nothing. She has every right to not answer me back.

She did end up answering me back, apologised for a lot of things, thinks and understands why I hold a lot of resentment and doesn’t blame me because she’s been a bad friend but doesn’t want to improve the communication and is happy the way things are but says she’s so lucky to have a friend like me, I thought it was mostly thought out and mature, she was also honest, only thing she didn’t think me being a scapegoat was a big deal and assumed I was okay with it

I again, responded very heart felt, I took the time to respond to thank her for apologising and sayin my peace, I wanted to keep my dignity and not start fights but I decided to clarify the scapegoat situation but I let everything else go, decided since it won’t change I don’t want to stay but was okay leaving it at that

Then….

She ended up responding again and that’s when it kind of went downhill straight up admitted taking advantage of me but in the same sentence says I don’t want the friendship to end and stay how it is. Everything else is “
I’m sorry you feel that way I assumed it was okay with you because my other friends are fine with it “
First message I was sad, second message I’m just pissed off now

I messed up and my message this time wasn’t as nice, I was done being nice, it was along the lines of
You don’t get to pick sides if you think I’m okay with being take advantage of and being used as a scapegoat without my consent you don’t treat your friends as expendable,
It might’ve been my bad for caring too much but I am done and not continuing this friendship

Then silence
I don’t blame her but she’s been a horrible friend to me I was too delulu to see that, i think I could’ve handled this better but I still feel great honestly after all that, best fucking thing to ever happen to me
Yall if your friend is shitty and is okay being shitty drop them