Our expert says:
He needs help for himself, but should not demand it from you, especially not by blackmail, and should sek it from the poper experts --- a counsellor, Lifeline perhaps to start with, and a psychiatrist. If he can't afford privat care, he should seek help from the nearest major state hospital and/or medical school.
You can go to a court and get an interdict to forbid him from harrassing you any further, and can explain to him, through the court, that while you are sympathetic to his need for help, you personally cannot provide it. And i you have real reasons to fear violence from him, approach the court for an interdict, and report the threats to the police. And get his parents involved, as they have more duty to assist him than have you.
And as others say, as an adult, he is responsible for his own choices and actions, so do not accept his invitation to feel guilty.
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