Friend? Maybe not anymore pt2

Sorry I let this unfinished I really have a bada memory and forgot to update 😮‍💨

So, this guy and "my friend" broke up. And I started to hear everyone's point of view. Many people were in his side, Red was/is in his side, because since he came the first day they've been friends. But, some of the people from the group (that had already torn apart by now) were in her side, so I listened to their part of the story. They said a lot of stuff I didn't agreed with, but I was trying to understand. Then suddenly they started to disappear from the place where the whole group spend the recess. So it was just me, Red and this guy. I started to spend a lot of time with them and we became friends. 

I think this annoyed "my friend" (not friend anymore, let's just call her M) because I noticed that her behavior towards me began to change. She stopped calling me by my nickname, stopped smiling at me, and even talked about me behind my back (like literally, I was sitting in front of her). She said something like "It's sad that it used to be (the friend I talked about in the first part) and (me) and now it's Red and (me)". Like, that is true, I spent more time with Red lately, but not because I was ignoring this friend, she stopped coming to school and I remind you that she was REALLY shy, so sometimes I was just talking to Red, and have this friend beside me in silence with her phone, but it's not like I don't talk to her, whenever I could I would talk to her, sometimes I just didn't know what to talk about, but I enjoyed her company. (Btw, I'm saying this in past because she left the school, she's gonna do another course, she wasn't feeling well with this one and I totally understand it) Well, this people on her side, specially one of them, started to tell me that I was letting this friend alone. First of all, from all the whole group NO ONE really cared about her being left behind. I did, I talked to her when she was alone in a corner with her phone, I was actually worried about her feeling alone as I did before. And second of all, did they even asked her why she was missing class so much? Did they care?

So, I started to distance myself from these people, specially from M, I unfollowed her and everything. But she doesn't realize it? She doesn't get that I don't even look at her, I try to talk the least with her. She just acts like everything's okay. Last day my REAL friends didn't go to class, and I was talking with a girl from my class and then they came and started talking to us and stuff and I just didn't now what to do. I went to the bathroom pretending that I was there for a long time and ended up writing my friends about it. I don't know what to do, I'm scared of having to talk with them about it or cause a fight. 

Honestly the only thing that I know is that the friends that I have now is the friends I wanna keep.