You are 100 percent, without a doubt, not wrong.
He wants to detox with you in attendance so he can cut down and get the lay of the land at his new job and then he intends to work it back in to his schedule. In what sane universe does that make any sense and why on earth would you be involved in that?
Your thinking is right, his is the thinking of an alcoholic.
No need to feel guilty about not feeling guilty. You are doing the right thing for yourself (and in fact for him too - whether he knows that or not is not your problem).
He sounds like a taker, pure and simple, he needs you when he needs you and treats you badly. I'm so glad you didn't let him move in! Good call there.