One of my comfort foods (though I never had it as a child) is plain pasta with butter and parmesan and black pepper. If I'm feeling energetic I might mince a few cloves of garlic and fry them crisp in olive oil along with some pepper flakes. No butter in that case, but still plenty of parmesan.

But I sympathize very much with your experience on that first dinner you cooked your now-fiance. All that work! And (um, maybe you should ignore this sentence, since you're engaged to him) you gotta wonder about a long-term relationship with somebody with such limited food tastes.