I’m just sad and lost

3 months ago, I had an situation where I decided to leave my friend group because I was being bullied really hard. I was getting pick on for a bit and I started to feel unwelcome but the moment I had enough was when a new person came into our group of friends and bullied me a bit hard and I couldn’t take it and I was just being dog pilled and I had enough after I left the group people were upset that I left. My close friend who is no longer my close friend unfriended me and block me after I left the group before I could tell him how I was feeling. The new person got upset with the whole thing said she was sorry but then had like this weird villain arc where she wanted the group owner gone. After dealing with her she left after getting also annoyed with how I told that the people there are different on how they deal with things. So for a while the only person I was friends with for a bit was this girl I really care for and became my new closest friend. Then a person in that friend group gave me some advice telling how I shouldn’t run from my problems and that I should apologize for leaving since I been told that people are mad because I didn’t try to fix the problem. But there were times apparently I did try to fix it since from outside sources tell me otherwise. So I did. Everyone expect my old best friend and 2 others respond to the message. After that I got invited to join the group back. With that time I mostly just been there when there’s a dnd session but aside from that I been hanging out with my closest friend. Months go by and well I see my friend hanging out with my ex. To be honest I feel jealous cause I can’t really be there since the dude doesn’t like me and I don’t wanna force myself there and I really want to spend time with my friend. I don’t know what to do I been feeling it’s all my fault that I’m in this mess.