Is it fair that I have to stop drinking altogether as well?

My girlfriend and I would drink every now and then and then, but over a few months my girfriend decided she wanted to quit, I had no problem with that. She now expects me not to drink anymore because she doesnt, but I don't think that is fair. Its not like I want to drink in front of her when she doesnt, or drink every day, i rarely drink as it is. What I mean is going out with my friends like once or twice a month and have some drinks.