Just because you want to say you'll be waiting if he gets into recovery doesn't mean you have to say it. It's too easy for them to pretend, or say the right things to make you THINK they are working on recovery. Let him wonder if you'd be willing to rethink things on down the road. Don't leave him an open door!
BUT...don't sit around waiting for him. Go on and live your life and concentrate on what makes you happy. He may or may not be a part of your future, but you can't let the now pass you by waiting on something that might not ever happen.