Hello and Welcome to Healing Well,
I guess being a romantic at heart, I would have to ask if you love this woman? You say you have no affection for each other but is that her disease causing that or do you truly not have any love left for her?
IMHO I would like to suggest that you at least see a counselor b/4 making a decision.
I know you can not make her quit drinking, that is her problem. She has to want to stop drinking.
I am sorry you are at this point in your life but all I can give you is support and you will have to look deep within yourself to find the answer to do you leave or do you stay?
Take care and again a warm welcome.