(16 year old boy in high school for context)

While I was dating my (now ex) gf, I made a point to let her be friends with all of my friends. We would all hang out as a group and go do fun shit together. It was great, but then she left me so she could “figure some stuff out” and none of my friends have hung out like we used since she left. From a little bit of snooping I found out my ex and friends hang out all the time. I was replaced. 

This was a month after “moving out” of my abusive mother’s house. I have no family or friends, and I just feel so alone. Any help or advice on what I should do now?