Hello MamaKay3, welcome to Psych Central.

That is a difficult one if he cannot recognise that he has a problem himself and if he won't go to the doctor that means he would reach crisis point before getting help. Maybe you could sit down with him and talk about it as a relationship issue, maybe say that you have noticed he has been unhappy. Ask if there anything bothering him that he would like to talk about. Sometimes talking about it can be a big release. If you sound concerned rather than pushy, he is more likely to not get defensive about it. If you start the ball rolling and put the ball in his court so that he feels like he has made the decision to get help rather than feel like he has been pushed into it.

You might like to try the Relationships & Communication and Partners of People & Caregivers Support forums for more ideas on the way forward with this.