Sounds like you've been through a lot with him and put up with more than many would have. You've made an investment but the problem is, the investment is losing value every day.
This is who he is right now and that is the person affecting your life. It is horrible but this isn't the life you wanted with this man. That life may have never existed or been a possiblity actually given his history.
Sometimes we get so hung up on our fantasy and how to make the person fit it that when reality hits, we feel betrayed. That they messed it all up when in actuality, this IS who he is and unless he decides to take recovery seriously, this will be your life with him.
Holding onto someone for as long as you have and seeing little change should tell you the outcome.