He has clean and sober since April 28th 2016.
Welcome, jrb.
I want to acknowledge your son for his sobriety which does not mean of course that it ends there. It takes constant work to maintain. There is a saying in AA called "dry drunk." The way I understand it is that a dry drunk no longer drinks alcohol but exhibits the behaviors and attitudes of an alcoholic. This may be the case for your son, as well.
I understand how hard it is for a parent to "risk" turning them away when it feels as if they could again make devastating choices, like before, without our support. And your son is milking your fear for all it is worth. He should not be rewarded but it is easy for me to say that about your son.
Much harder for my own, where it is my life and my heart on the line. Which how it feels to me sometimes. Except it is an illusion that there is anything that we can do to protect another adult human being, even if this is our beloved child.
First, any time he comes near uttering a suicidal threat, or infers such, call 911. Every. Single. Time. My son did this. He no longer makes threats nor does he tell me that he is suicidal. This type of manipulation has to stop. If he is suicidal he needs inpatient hospitalization.
You cant change him...he needs to change himself.
This is it in a nutshell. As long as we maintain and support their fantasy that there is some connection between their needs, their words, their manipulation and our actions--we maintain them dependent upon us, believing that if they frighten us enough, make us pity them, worry about them...that this state of mind, in us, will generate what ever it is that they want. In this way we reward the very behavior that needs to be extinguished.
"I'm gonna kill myself", "I can't find a job", "nobody will help me",
He is not to old for the military. In my state there is day labor and agricultural work. There are fisheries and fishing boats in Alaska. Shale pipeline work in the Dakotas. There is work to be had for those who want to work.
If it were me, I might take a break from him. It sounds like your role right now for your son is to be his punching bag. Somebody to punish and blame for his situation and his life. Until he gets some self-control and begins to locate his agency in himself, and develops some autonomy what really can you do?
Most all of us here on this forum have taken this step. It is hard, but it gets easier.
You are doing great. None of this is easy. Welcome. Take care.
PS I have a long-term partner who is not father to my 28 year old son. It is very hard to be caught in the middle. Today I told both my son and M: I will not defend him anymore. Nor will I be held responsible. If my son is not able to meet household expectations of the both of us, he cannot come here. If M has problems with my son away from here, let them handle them directly. I was crushed between the two of them. This is no place to be.
Your relationship and home have to be protected. Your son, and my own, are not minor children. Enough is enough. I agree with your wife.