Either way, I guess that doesnt really matter. I think that you need to write up a budget, a realistic one, and send it to him, telling him exactly how much you need from him, and save a copy for yourself, and tell him that you need this, or you will send one to his commanding officer.
This isnt about pushing him around, or being a bit(*, its about getting enough to make ends meet. And if he gives you money when he gets paid, what tomorrow, right?, none of it will matter.
I guess I gave the wrong finger to the wrong man...