What should I do?

Yesterday my best friend X told me they didn't want to be friends anymore, so, I started to panic after she messaged and reached out to two of my other friends, B and Y. B didn't read/reply to my message so I message Y, and after I told them what happened they told me they knew. All I could think about while they asked me if I was okay was that X told all my other close friends (all our closer friends are mutual, so I can't exactly talk to any of them about how I'm really feeling) what they were going to do and that X probably asked Y how/what to tell me. So I stopped replying to Y. And I haven't been online since, but they also haven't attempted to reach out to me through messenger either. I don't know if that makes me feel better that they're respecting my space or paranoid that they don't care enough about me to reach out..

In X's message to me they said they thought that our relationship was toxic, unhealthy and that we should limit contact as much as possible..but they didn't give any examples as to how they thought this was true.. Then they said they thought it was a mutual feeling. I didn't even think anything was wrong.. We've had fights in the past, but friends have fights all the time and I thought we worked through them well. X was my first friend (3 almost 4 years) and I love them like a sibling. I do respect their decision but it hurts a lot.. Normally I just shove things down but this has been the only thing on my mind since it happened..