I believe Lotus has a wonderful suggestion.
It sounds as if he (and the addiction) will try to play all the cards in his hand in attempt to sweet talk and promise you in order to keep the reality from changing. But once again, if nothing changes then nothing changes.
You have told him what you want, but he is not really listening. You are doing good by not making the promises. This is a perfect time to make and utilize boundaries to get him to hear and respect what you want. As Lotus stated the follow through is the most important part of setting a boundary, which also happens to be the hardest part. Stay focused on what you want for yourself, and don’t allow him to manipulate those soft spots to get you to cave.