Hi TJK & glad you stopped by

This is so great a place to just vent.
In the oddest sort of order, when you said, DH will deal with things after the "stress" what is it referring to? Is it something at work or ex-wife or something just inside?
Divorce and step-anything is just huge stress. It really is. However, boundaries. Key to anything going forward.
A 16 yr old that has not 1 home but 2 to do as they please, well in the real world we're lucky to have just the one we can come home to, relax at times and call home. He hasn't learned this yet. Hasn't felt it in his own skin. The reverency of that safe "home feeling" this kid just doesn't have and it's seems it's on the verge if not all the way of tinkering around with manipulation. Will money factor into this at all or does it already?
The first part of your question is simple enough. Stop feeding him. If he can drive and come and go as he pleases, he can use a microwave or order a pizza or keep toast around the house or mac and cheese. Frozen dinners? Anything. This would elleviate some of the stress.