I NEED ADVICE. (2)

Okay continuing my storytime, after she storms off she goes to some of her friends - which I don't know and is obviously talking about the situation and she looks livid and I don't like to assume but I heavy assume she talking about me and how absolutleyyyyy awfulllll I am to people I DON'T KNOW!!! Like is that rude to only me? Then later that day I sat next to her in class..... she came in late and the first thing she said is "this is pathetic" I knew what she was talking about but I wondered if she had a specfic thing in mind so I asked her to ellaborate she then just said "THIS." which okay I get the frustration but I just wanted a little extra context. She then continued to tell me she felt like I was picking and choosing when I wanted to hang out with them. Which I understand where she got that from but I explained to her that the reason I decided to distance was because I was not okay and even if that was 'picking and choosing' I feel like my own stability and mental health should come first and she should've understood I was hurt and supported me instead of blaming me for my respectable choice to leave a position I was severeley unhappy in. And when saying 'support me' I literally mean the bare minimum. Something as simple as respecting my opinion or keeping your negative thoughts to yourself. But despite me not fully agreeing with everything she was saying I understood that's how she was perceiving it and it was my fault it came across that way. So I apologised. Over and over agin. "I'm sorry it came across that way but those weren't the intent of my actions." I think those words left my mouth 1000 times that hour to the point I was fed up. And again, everytime I would speak she would dismiss my opinion, then tell me I was wrong. I thought she was wrong too; but I never said that? I was understanding and apologised for things I HAD NOT done. I literally apologised for my Mum having cancer? How does it get to that point. It was so inhumane to sit there and have your opinion dismissed, feelings called invalid, and apologies "not good enough." and for her to go to one of her mutual friends and say I denied everything is so low. And I always follow my made up saying "You never know what someone's perecption of a situation is, so leave their opinion be." But this is my only exception to following that. Because DENYING? HELLO? Now where did you get that from? Later that night I cried because having my opinion and feelings be dismissed for a full hour is rough and have to listen to someone slander your name to your face when you stayed so mature is AWFUL. And that night, Eliza and Layla had netball. I know what Layla's like, and I knew she would tell Eliza ASAP and portray the situation as something it wasn't. And as Eliza being my best friend - I called her. I called her crying, saying I was hurt. I didn't tell her the situation because I didn't want her attitude toward Layla change because of me. But I did tell her to remember there is ALWAYS 2 sides to a story. Eliza then told me "yeah she probably will talk to me about it, she always does." Excuse me? My best friend and the girl how made me feel like a rodent 'always' talk about me and these situations. I mean that was just a great feeling. Eliza then told Layla all about mine and her conversation, which was PRIVATE, and idk if my expectations are unreasonable but I expect a bestfriend  to have my back and not spread my private conversations. I was hurt hurt. Like hurt hurt hurt. And to this day she's never had my back and is still friends with Layla after telling me Layla was in the wrong and shouldn't have done that. Half of me doesn't want to put my friend in a situation of picking between me and another, but the other half just wants her to have my back. Because I know in a blink I would drop everyone and everything to have her side and her back. Am I the a-hole?