Your husband sounds a lot like my ex-boyfriend. I believe he had borderline personality disorder. He was my best friend when we were teenagers, and when he fell for me he threatened to kill himself if I didn't go out with him. Of course I didn't want my best friend to die, so I dated him even though I had no attraction to him. We dated for a few yeras, and every time any problem came up (we fought, another guy checked me out, etc.) he'd threaten to kill himself. He would cry that no one cared about him, he was so lonely, his mother physically abused him as a kid, school was too hard, his life was so terrible, etc. He had an obsession with things like swords and knives. When he was upset about something, he'd use one of his knives to mutilate himself. He cut his arms, making lines on it - like hash marks, or whatever you call them. Like if we fought, he'd make a line for each day we wouldn't talk, and the day we finally made up he'd show me a scabby, gross arm with a few new slashes on it. We finally broke up when he decided he was in love with someone else. Let me tell you, THAT p****ed me off! I wasted two or three years of my life on this loser, who I never liked in the first place except for as a friend, because he "couldn't live without me" and thought I was saving his life. :angryfire
When I started dating my now-husband a few months later, he was livid even though he was still with that other person. They didn't last, but husband and I obviously did. This was ten years ago that we broke up - and he still calls me every couple of years. He'll cry about how lonely he is, and how he should just kill himself because no on cares, etc. I used to sit and talk him through it, meet him for coffee, stuff like that. The last time, about two years ago, he called at 2am. I was so mad - I gave it to him straight. Told him that we are no longer friends, and who in the h*ll did he think he was, calling me in the middle of the night? I told him he had a serious psychological disorder called borderline personality disorder, and the he needed to see a psychiatrist. I said if he still felt suicidal to go to the ER and they'd take care of him. Told him if he got some help and sorted himself out, maybe then we could be friends someday, but that he was never to call me again like that. I am not his guardian angel, I am not his savior, and I am certainly not going to be responsible for his life or death. GOOD-BYE.
He's still alive, far as I know.