Could be a number of things but the one that comes to mind is he is an alcoholic.
If he is looking for therapy to help stop drinking, I'm sure they would be happy to help him. If he just wants to keep on drinking and won't be swayed from that, what's the point? It's kind of impossible to know where to start when someone is drunk.
Addicts can be very narcissistic, delusional (denying he even has a problem). Maybe he was only going to therapy to please you but I doubt any therapist, except the worst, would waste their time on someone who isn't interested in making changes.