AITA FOR TELLING MY BFF SHES RUDE

Okay so my best friend we'll call her Mia has a bf we'll call him Bean. Mia and bean started dating recently and before they started dating Mia was crazy about him and had a crush on him for more than a year. Today she told me that she's gonna break up with him bc he texts her too much and when she tells him to stop texting her he would say "I know I'm annoying but I love you". When she told me that she's gonna break up with him I said that it's a bit dum to break up with him bc she likes him so much and I feel like she should be a bit nicer to him. When I said that she said " okay but that fag**t is so annoying like he should just stop texting me, so I'm just gonna break up with him tomorrow so I don't ruin my day". When she said that I just said okay you do you and then I asked if she's mad at me bc she's acting like she is and now she left me on delivered for pretty long so AITA for saying that

Edit: she doesn’t usually act like this and she’s an amazing friend and it’s her first time acting like this and I’ve never heard her talk like this before so I will see how she continues acting if she continues being like this I will get better friends ( btw I will post updates if anything happens)

Edit: just a clear some things up a lot of people think that she talk behind his back but she told him the exact thing that she told me, but he just didn’t really understand it and she’s gonna tell him tomorrow like she wants to break up so I’ll post updates and see what happens.