I can see why you're not certain of the question you are asking because you already know the answer. I mean that in the most admirable way!! There is a strength to your post that I wish I could find some days.
It doesn't sound like he's learned a damn thing and believes he perfectly fine. I bet he thought that before he ever went to rehab the first time. I doubt the professionals in rehab take it personally, so you sure shouldn't.
You may not know what he's thinking or what he's going to do next, but it doesn't really matter does it? He could announce that he's going to paint himself blue and mail himself Jupiter. That's nice dear...have a nice trip.
You stick to your word. He can come back to you when you choose and not a moment sooner, and even then it's if you feel like taking him in.
Stay strong!!
Alice