Is my friend a sociopath/nihilist? How can I help him?

Anonymous
We've been friends since we were 10, he was always a quiet and caring child. People our age used to bully and gang up on him, it didn't help he was very sensitive as well. He believed that if he cared for others they would care for him. I know he grew up with no family, they abandoned his parents at a young age, family life at home was somewhat unstable he would complain that his parents would get verbally and physically violent with each other. But anyway, when he got to 14 onwards, the bullying he faced became worse, he got rejected and tricked by many girls, who posted his private texts to them online and humiliated him to the whole school on social media. Well, fast forward, he says many times he doesn't care if he lives, he has become extremely confident, particularly around women, he's bold and charismatic with his opinions. But if things don't go his way, or others disrespect him including adults, he becomes angry and sometimes it's quite scary. He threw a chair at a kid who called him ugly. Anyway, I'm worried about him his personality has gone a pure 180 and it scares me. Especially when he says sometimes he doesn't care what happens to him if he lives or dies. Any advice would be great, he's the same age as me 19. He's been my best buddy and helped me for some tough times. So I just want to be there for him as not many are
Is my friend a sociopath/nihilist? How can I help him?
2 Opinion