Did you two agree what would happen if he relapsed?
The good thing about agreeing on this beforehand, is if you need to go ballistic on him, it is written down that this is what response he agreed to. This document might be helpful for you to determine if he is flipped out and getting back into recovery or flipped out and plans to keep reuniting with his DOC.
http://feast-ed.org/Portals/0/Relaps...onContract.pdf
Good luck.