it sucks to hear, but you're standing in a burning building & you can only save one of you. do it --- there's fresh air outside.
addiction this engrained has no boundaries. when it comes down to it, she's worried about her survivial - not yours. there is probably much you don't know but what you DO know is enough. trust that life will bring you someone capable of loving you the way you love her when the time is right...
best of luck!!