AITA for ignoring my 3 years of best friend?

I have two 3 years of best friends. We were like trio.
Im met my best friend of 3 1 in online school , which i also i met BFO3 2. Let’s call them 2= Mai and 1 = Ki.

The first day of school, we had teachers and students induction part and Mai and Ki were there. And we didn’t know each other yet. After the school, probably at night
i reach out to her and said "you’re look so generous.. blah blah blah" we talked for until 12 am. After about a week, we became friends.. Like Real colse friends or so i thought.​We were friends for about 6 months, then we stopped talking for around a year and a half because I blocked her for about an hour. That happened because she called me out in a group chat where all the teachers and students were present. I don’t want to explain what she said or why.
While Ki and I weren’t talking, Mei reached out to me. She wouldn’t say anything she would just call me in the middle of the night and show me that she was eating snacks. She kept doing this for about a week. I started to feel annoyed, but I didn’t say anything. Eventually, we became friends.After finals,After finals, Mei and I got into the top 3 class, and Ki got into the top 1 class (there are like 5 classes).
I don’t remember much about the second year, but one thing I know is that our class and the class Ki got into competed with each other for first place in every competition. During midterms, Mei added me into a group chat that Ki was in. Keep in mind that I didn’t know Mei and Ki were friends. Before Mei added me to the GC, she asked Ki and the other members about it. The other members were pretty chill about it, but on the other hand, Ki didn’t want me to be in the GC at all and told Mei not to add me. As you already know, Mei didn’t listen and added me anyway.
By the third year (which is right now), keep in mind that neither she nor Mei apologized to each other even after years passed. All of us (Mei, Ki, and me) got into the top class. Mei and I acknowledge each other in the GC, but we barely DM each other.
She always called Ki and me out for being too close friends and asked why we didn’t include her. Keep in mind that she has another friend GC with her second-year classmates, which she gives more time to than us. Every time she argues with them (the members in the other GC), she comes to us and talks about how she hates being friends with them and how she now knows how good Ki and I are to her.
However, when she gets along with all the members in that GC, she doesn’t care about us, barely replies to us, or only says things like “ok” or “cool.” This cycle continued for two whole years, so when Ki and I decided to ignore her, she texted in the GC that no one cares about her (which includes me, Ki, and other friends).