My Close Friend Stopped Talking to Me and I Don't Know Why

I'm 16 and my close friend stopped talking to me about a month ago without any explanation. She stopped responding to my texts and removed our pictures together. When I tried to ask her what's going on, she ignored me. Now two of our mutual friends are doing the same thing at school, and I have no idea what I did. I've tried reaching out multiple times, but nothing. It's really stressing me out. We talked about how when multiple people cut you off at the same time, it's often due to someone saying something about you, true or not. Not getting an explanation shows they might not be real friends. The suggestion was to stop reaching out and focus on friends who actually want to be around. I realized that the lack of communication might mean it's not about something I actually did. It was suggested to stop feeding the anxiety by overanalyzing and instead focus on people who communicate with me. I decided to try and stop overanalyzing the situation and focus on the friends who actually show up for me. It helped to hear that it's not necessarily about something I did wrong.