I don't know what to do. The fact is that I broke up with my girlfriend and now I'm very lonely.
That's a pity. Try dating sites.
I understand that I also felt not very well after I broke up with a girl. He even wanted to commit suicide. But then I found and chose for myself what suited me. I started communicating with girls and it seems like now I even have some kind of relationship. I hope that everything will get better for you.