Not one bit wrong. There will always be "one more chance" he wants. There also will always be another event or circumstance that makes it "not a good time" for you to leave.
I'd suggest you consult a lawyer at your earliest opportunity and factor into your decisions the information you get from the lawyer.
You are both stalling, and ten years from now you could be looking at the same situation, only much worse. I wouldn't make any decisions based on what he tells you. He will tell you whatever he thinks you need to hear to get you to stay.
If you leave and he decides on his OWN to stop flushing his life down the drain, you can revisit the relationship. AFTER he's solidly sober. For right now, I'd suggest doing what is in YOUR best interest.