How To Get Rid Of A Stalker ?

Hey everyone, this is my first time posting here and I don't really know what to say so I'll just go with the story. I met this guy two or three years ago and at start he was really cool and nice with me, nothing to say.

He was just clingy but nothing serious and one day I announced him that I was in a relationship with someone else and he didn't take it very well. He told me that he was going to kill himself the same day, that I broke him and I was a horrible person for that.

I tried to help him, tell him to come back because I was scared and I didn't want to lose a friend and until this day it became hell. Next thing, I couldn't talk to anyone else but him, if I was trying to play games or just being on discord with friends he would get angry and threaten to kill himself or harm himself.

And one day I took the decision to block him everywhere, he came to my house and speak with my parents. He said he was going to take legal actions against me and I did too but the authorities didn't do shit. No one helped me and I was going to harm myself too, I went to the hospital several times and spoke with doctors and therapists but still nothing.

I tried to seek help with gaming companies and they didn't do shit neither. He created multiples accounts and tried to speak with me, he stalked me on every video game I'm playing and still do I think.

I'm thinking about block him everywhere again and just disappear and tanking his shits until he stops. He tried to tell everyone my private information, everything about me and I don't think I can last for long with him, I just want to disappear and harm myself to finally be in peace.

The authorities didn't do nothing, he was banned for several games for stalking and harassing but he didn't stop and told me that he won't stop, even if it takes months or years. He bought me a PC that I didn't want at first, I accepted in the end because his requests were incessant. I have told him several times that I can give it back to him if he wants it.

My question is simple : What should I do ? Tanking him until the end of my or his life ? Or just block him again and wait until he stops ? I don't think I can live like that for very long, I lost my friends, my joy and he took every little bit of me and crush it. Please help me.