Hi Florence,
It's entirely your decision. If you are not an alcoholic and you want a glass of wine, have a glass of wine. If not, not. Their disease should not dictate our behavior, and if it does that is a symptom of our codependency.
That's not to say we throw it in their face. I share a home with my wife who is an alcoholic so we have no alcohol in the house. If I want to have a beer, I go have one at a bar or with buddies, or in the garage while I'm working on a car or bike.
When we are out more often than not I don't drink, but if I feel like a beer I have one. I try to balance consideration for her as the woman I love, with my own recovery from my disease of codependency. I'm sure I don't always do this perfectly, but that's the goal.
The one thing I know is that if I allow her behavior, or my need to control and protect her, to dictate my own behavior, then that's a big problem. My big problem-- not hers.
Take care,
Cyranoak