My husband and I have completely opposite tastes. He loves meat and starchy carbs. He could live off of steak and potatoes, hamburgers and fries, and shepherds pie (hold the veggies!). When we got married I wouldn't be surprised if he went weeks without eating anything green!
My favourite foods are stir fries loaded with veggies and topped with interesting ethnic sauces. I also love raw salads, curries, and anything with tons of flavour. I am not a big meat eater, I could easily be a vegetarian and I wouldn't feel like I was missing out.
I am telling you all of this to let you know that if you live with someone whose tastes are different from yours, you don't need to cook more than one meal. My husband won't eat everything that I eat, but his tastes have hugely expanded. He has learned to enjoy vegetables, he actually loves tofu, and he regularly requests different noodle bowls and salads. I make sure I still cook "meat and potato" dinners on the regular too.