LynnG~
I hope you don't mind my responding to you on one thing. I have to admit, I also believe that God is still moving and working in your marriage and in the life of your dear hubby, because although they are imperfect attempts, I do see that he has willingness to keep trying and keep working toward repair and repentance.
For me, I kept HOPING that he would be willing when he wasn't. I kept HOPING that things would change he would make the effort to actually really TRY to change, and he wouldn't. I believe that is an entirely different situation from yours. In your instance, he has bad habits and years of making bad choices, but it does sound like he's willingly making the attempt to grow and change--just doing it imperfectly. With me, he was unwilling to make the attempt to grow and change. I had been thinking that as long as I was in his life God could still work on him and move in his life--and finally at one point I realized that I was standing right in God's way! I mean, how PRESUMPTUOUS of me to assume that God would no longer be with my ex if I wasn't with him...as if God couldn't work without me! :o
Yeah--our exes our dearly beloved children too, and God loves them and wants them to want Him. But He will work in their lives, in HIS way, whether we are there or not. And that's the difference.
In your instance, I completely understand that you ARE tired and WHY you are! That is so 100% completely understandable. Further, I suspect most people would say you have every right and reason to leave the marriage. But personally I would suggest that perhaps rather than leave the marriage that you "take a break" from shouldering the burden. Give it to God and your dear hubby for a while. If you need the rest and peace that comes from being apart for a while, I think that's reasonable and tolerable--so that your dear hubby and do the work he's got to do but you can step out of the constant drama tornado that whirls around him.
One BIG thing I learned is that when a person is doing a lot of personal growth or even relationship growth, you can't always be moving forward and growing. It's too exhausting. Sometimes good, mature growth means standing still, standing where you are, and not backsliding so you can catch your breath and make the changes permanent.
So YEP--rest.