What should I do [i'm really very worried]?

Don't give in to pressure.
People that are really that desperate to commit suicide usually don't announce it and seldom publicize it.
Unfortunately, this is a pathetic attempt to keep you hooked and to give you a bad conscience but rest assured, nothing will happen if you remove your account.
This type of people suffer from some psychological issues and need professional help. By telling you that he will commit suicide, he wants your attention and nothing more. Him not being active since you talked last is just a scheme to manipulate you. Don't fall for this kind of manipulation.
The best for you is definitely to sever the ties with this guy because otherwise you are letting yourself into something that will be very difficult to get out. This guy is manipulative and the least you have to do with him, the better for you and your sanity.
Firstly this isn't your fault remember that and secondly it's up to you if you want to try and reach out to him again i don't know if he just wants you to worry about him or not the i think the ball is in your court if you don't want to be on social media then that is your choice nobody should make you stay especially through guilt or something
I know you don't but it could be just to put you on a guilt trip i mean i don't know him or his situation and why he tried to do it before. I know it's not the same but my wife apparently tried and now I live with the guilt and fear if I leave again she will and it's not fair to live like that but this is just my opinion but you should do what you think is right but please don't fall into a trap like I have
If it makes you feel better talk to him but explain what he said isn't fair on you and if he loved you he wouldn't of said what he did. If you do speak to him can you let me know he is OK please
Tell his parents. Call the cops to do a wellness check on him.
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