You'll know he is serious when he goes to rehab, stays in rehab to the end and does what he's told, and then comes out of rehab and starts a program (AA or something else) and works that program for several years.
Until then it's all ******** and you'll just go back to the same old ****. His words and deeds are stereotypical of exactly what they do when their enabler actually leaves. Don't be fooled by this. His refusal to go to AA is all you need to know.
Most importantly at all, if you really want your life to improve, please try some Alanon meetings.
Cyranoak