AITA For stealing my friend’s friends?

So, I (F15) have a girl I’ve been friends with for a while (let’s call her Emma), and at first, she introduced me to her best friends. I really got along with them, and she has always been kinda possessive of things that "belong" to her. After a while, she got hurt that we started to get along "too well," so I stopped being friends with them (we eventually became friends again, but that’s another story).

This past year, Emma has been really dramatic and defensive to the point where calling her out will result in none of her friends talking to you unless you apologize to her, or scream at you for making a exetremely small mistake (like moving her cup a little or forgetting to bring her something). So I was planning to stop talking to her unless extremely necessary, but then came her birthday, and I had no good excuse not to come. So I came, and there Emma introduced me to her other friends and encouraged us to get along, and we really did, but this time I didn’t stop being friends with them, and we started meeting without her (at first I asked them to invite Emma too, but then I found out they didn’t like her either).

So now I and "Emma’s" friends are really close and shes not liking it, and one of them can’t keep a distance from her since if they do, no one in their class would talk to them anymore. And somehow, almost every meeting me and "her" friends, we end up talking about this, and I feel really bad for acting like this, but everytime i talk to her i understand why I do.

So AITA for acting this way?

(I apologize if anything is unclear or if I missed any information, since it’s my first time writing a post like this and because english isnt my first language.)