Firstly, it's not your fault!
You can google the personality disorder he has and read up on it, see if there are any forums you can joined about that disorder to ask questions.
Best thing to do is educate yourself and also be very open with him and let him know you are here to help and ask him what ways he wants support. He could want somebody there to talk to, but he could also want somebody there to distract him from it and do fun silly things, so ask him what he needs.
Good luck.
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