You don't have to give up drinking or going out to stay healthy. There are a few tips to keep you on your plan even when you're at a bar. You could limit your number of drinks for one. Choose lower calorie options. Drink a full glass of water in between each alcoholic beverage. And then, of course, limit the number of times a week you go out to drink. Once a week? = Manageable. Every other night? = Time to find a hobby.
Living with someone who isn't as healthy of an eater as you is difficult, but remember, you're in charge of what goes in your mouth. First, announce your plans to your partner. Tell them that you'd like to avoid certain foods, and stock up on newer ones. Tell them that they don't have to do the same, but you'd like a little change. Enlist their help by asking that they not tempt you with foods you'd rather not have by not offering them to you.