Hi, I think you have to make him realise that and remind him of what miserable life he had and difficulty before , it is hard but if you ignore it and left it then he gets deeper and deeper , he has to find him self and his weakness inside to be able to not relapse again he has to attend
support groups and have person who been through this before . You need support to be able to help your self and your husband. And takecare of your boy.
If need any help or want to talk to someone i am hear ,pray for him and make him to be nearer to god and i pray god will help him to find job soon .