Based on my experience, his not going today is a big red flag. When an "A" is really ready, they will walk, crawl, take a bus or ride their bike to check themselves into a rehab program. When they pospone, it is not a good sign. If he really wants to get there on Monday, he will find a way.
I would suggest that you read the stickeys at the top of this forum, cynical one's blogs, which can be accessed at right above your post and read Codependent No More by Melodie Beattie.
Keep posting, it will help.