Damn. No, as others have said (& believe me, I do know how hard it is to embrace it), not your fault. At all. Relapses just happen, & there's always the self-imposed guilt factor. It'll consume you if you let it. You were his sponsor, not his leash-holder. As hard as it is to have to suffer through, you weren't to blame. Bad things happen, & sometimes the only solution you can find that makes any sense is the part about"the wisdom to know the difference." Good luck, David. Beating yourself up is a step back in your *own* recovery. I know.