The husband of my friend disappeared yesterday

They are married for quite a few years and have two kids. He was talking on the phone with his brother normally and after he disappeared. His phone was stolen yesterday and from his note it seems like something in him has snapped. He wrote that for the past two years things keep happening to him and that it looks like now that the demons might finally win. We cannot make sense of it. Police is informed. No known history of mental illnesses or depressions. Though he smoked a lot of weed a few years ago. Not sure if he still does. His wife is crying all the time worrying he might do something to himself. Any ideas or advice is welcome. Could it be a mental illnesshe has kept hidden? Is. there anything we can do?

Edit/ Update: OK now his wife says he was attacked and robbed two times the last two years and also attacked by a junkie once. He had nobody to talk to or went to a therapist. I would guess PTSD or a combination of that and other trauma responses. Are ppl not taking care of each other anymore nowadays? I'm angry at my friend, even though I was never close with her husband. I mean, it's obvious he should have talked to a therapist even after just one of these things that happened to him. :( I really hope it's not too late and he gets help. If they find him, I'll update you guys.

Update 2: He just picked up money from an atm. So he is still in town and alive apparently. And you are right. I should not have been mad at her. It was just an immediate reaction in my head. I didn't tell her and I calmed down. I'm just a bit stressed myself. I just try to be helpful to her and not add any stress. I just told her that he needs psychological help once he is back. I hope she will get him help.

Update 3: He came home this evening. That's all I know so far, but I wanted to let you know.