Dreadsgirl,
If he is staying with you, you have to decide your boundaries. If you are not willing to throw him out, for not helping financially, then it is better to detach, as you are doing.
If you are trying to keep him from using, though, that is futile. Keeping money out of his pocket probably wont make a difference, if he wants to use.
If you and he have any kind of working relationship, he should contribute, if he lives there. I assume he has a job, since he got paid? Or maybe he lost that job, since you said he says he has lost everything?
regardless, I think its good that you do not try to find where his head is at. Thats his job, to get his self well. You take care of you. And that means having boundaries.
best of luck to both of you.