Just like GardenMama said, you'll know when he decides to help himself. You did the right thing. Nice work!
When my sister first started calling from jail she initially tried to sound normal, like nothing was wrong. I think she was overcompensating in an attempt to not sound like withdrawals were about to start, because she thought that if I knew she was really sweatin' it I would say no. I said no anyway and the calls got more desperate, so keep up your resolve!