I'm wondering if he's feeling overwhelmed enough that lashing out is easier than figure out the numbers. Do you think it would help to have a cup of coffee with your H and go through finances (who's debts are whose, etc.)?
I know what you mean about 'divorce me already'. I'm stuck in that rump, now, but for a different reason. Having this feeling has made me an irritable person to be around at times, and my claws haven't retracted just yet.
Did you ask him why he quit? Maybe if he wants to vent it to you, he might realize that you provide a need for him that he's loosing - a person that can love and hear him out. The IC can hear, but not lovingly. Coffee to talk over finances can lead this way - if you want it to.