glad to hear that he's sober but hate that you think that he is trying to get out of rehab. you can insist that he go and he may go but that does not mean that he's ready to work the program and stay clean, may give him valuable tools of recovery but it will be up to him to use them, so if he thinks that its a waste of money then he may not be ready for that yet.
i say hands off the addict, but the choice is yours. if he really wants it, you won't have to insist that he go, he'll go because he wants to. sorry that you are confused, maybe it time now for you to take the focus off him and whether or not he goes to rehab and decide what you will do to make your life better.