Lost a friend

Hi, so this is my first time doing something like this, I just really need to get this out and I don’t have anywhere else to go. I used to be friends with this guy and we had a whole friend group. The group has pretty much isolated me and he now hates me because I vented to him about my mental health too much. But the thing is is that I always asked him permission before venting and he always said I could vent to him. Then he just stopped responding to any of my messages and pretty much said he’s too good for me. I was scrolling through the group chats old messages and it made me so sad. I can’t get it out of my head, I miss them so much.