How do I convince a friend that he needs treatment?

My X was recently hospitalized after a psychotic episode.
He was released with an ‘adjustment disorder’ diagnosis and given an outpatient program.

Instead, he left the state. He’s under the impression that members of an elite and evil fraternal order are out to get him (part of the New World Order.) He’s convinced they’ve tapped his phone and hacked his computer, that they sit in unmarked vehicles and watch him.

I’m one of the only people he trusts and the only one he’s contacted because we live far from each other He’s afraid they’re going to go after his family if he calls them.
I’m no position to travel and I don’t know what to do! His elderly mother and siblings are of the impression that I’m the one who can reach him. Anyone have experience with this stuff?