Congrats on taking the difficult step you have. Remember that actions speak louder than words. He can say anything but its meaningless unless his actions validate them. IF he is truly interested in sobriety, her will begin. Now.
I found it best to proceed with my life based on what was best for me and my children. If my now xAH had begun finding sobriety, I would not have considered going back to him until he had a considerable track record of sobriety behind him. Of course my xAH still won't even admit he's an alcholic.