It's kind of like meeting a guy who lives in a cardboard box. Forget about alcohol, just assume he lives in a cardboard box. He tells you he LIKES his cardboard box. You ask him whether he would be willing to move out of the cardboard box if you were going to leave if he didn't move out of the cardboard box. And he says, "Maybe... If you said that and I wanted you to stay badly enough."
Same thing. Why stay until you can't STAND it one more second, on the mere slender hope that he will change his entire existence to keep you?