AITA for refusing to take sides in my best friends’ fallout and staying neutral even when one of them felt hurt?

I was in a very tight circle with two girls, A and B. We were real best friends until A and B fell out badly. In one of their many fights, A cursed B’s mother over the phone. After that, they just stopped talking.

A narrated her story to me first and later on I got B’s side of the story through a mutual friend. I decided right from the beginning that I was not going to pick sides because their fight did not concern me plus I did not want to lose any of the friendships. I kept on talking to both of them.

A started showing jealousy when I stayed with B again. It sparked at the club party. She got very drunk, saw a guy who had previously harassed her, and did not want to be alone. I immediately let her come with me and the guy I was seeing.

While on his scooty, she suddenly started screaming at me, accusing me of choosing B and saying her mental peace was affected because I was still friends with her. She insulted me and even shouted at the guy when he tried to defend me. She gave me an ultimatum: if I kept talking to B, she’d distance herself from me.

Totally blamed it on alcohol the next day, asked me to forget about it-no apology. I slowly withdrew.

Found out later that she had been talking badly against me and also trying to convince my closest friend against me. That friend never believed her and later told me everything after falling out with A herself.

I feel drained and betrayed by someone who i tried being neutral, respectful, and understanding to. AITA?