AITA for letting my friendships end because of my boyfriend

I had close friends from high school for 6 years, but the friendships drifted apart when I started dating my current boyfriend. One of my former friends, "A," lives near my boyfriend and would often share stories about his alleged actions. When I confront my boyfriend about these claims, he admits to some parts of what "A" said and add other parts. I was caught in the middle, unsure who to believe. My best friend of 6 years, "A," had my trust, so I leaned towards believing her. But when she told me she saw my boyfriend cheating, I should've been more skeptical. Instead, I confronted him in anger, and it turned out "A" was lying all along. When my boyfriend confronted her, she admitted that someone else told her about the alleged cheating, not that she witnessed it herself. Now I realize I was misled. After "A" was confronted by my boyfriend, she sent me hurtful messages, calling me wicked and untrustworthy. She said she wouldn't speak to me again, and I blocked her without responding. But things took a turn when "Gigi" texted me, confronting me about what happened. Apparently, "A" told "Gigi" that I was sharing her secrets with my boyfriend, which is completely false. I know "A" was the one sharing secrets because my boyfriend would come to me with the information, and I'd tell him it wasn't my business. When I denied "Gigi's" accusations, she didn't believe me - she automatically sided with "A." I was shocked and hurt that "Gigi" didn't even wanted to hear my side of the story. I even told "Gigi" that she doesn't have to take my side but atleast hear my side of the story ;she didn't listen, she didn't try to understand she just believed "A" , about a day after when I was visiting my boyfriend "Gigi"sent me screenshots from "A" saying very hurtful things but what hurted me the most is that she called me a whore because of the silly mistakes I made in my past I thought she wouldn't judge me and wen she called me a whore it further confirmed what my boyfriend told me ; When we met he told me that she said that about me and I did not blv him he always warned me about her but i thought i could trust her anyways "Gigi" texted me that she wasn't going to take sides and whatever but she did because after that message we have not spoken since I believed for many months that i was in the wrong i kinda still think so but what do you think, AITA?