In reading your other posts, this mirrors your own pattern of drinking. You stay sober for days, then drink on the weekends. Maybe having a partner who does the same makes you feel your own pattern is okay?
You mention from time to time you want to stop, but you'd be alone if you did. I have to tell you, this is simply not true. Many people don't drink at all. Many people who DO drink don't drink every weekend, or abstain around their friends who are trying to stay sober.