It's true that on occasion we also have different evening meals. Perhaps once per week on average.
Luckily we both enjoy the same foods. But in line with what you've indicated, sometimes my wife wants to eat rice with something I'm not fond of. Now I could easily go along with her suggestion and eat the same, but actually I don't want to.
Like last night we agreed on fish, but mine was pan-fried, whereas my wife 'cooked' hers in vinegar with ginger garlic and onion etc.
We both accept that there's no reasons why we both eat the same evening menu if we don't want. After all, whenever we go out for dinner it's not always the case that we choose the same.
We've always managed in the same way and it works for us.
Doesn't your wife get a little fed-up with the very same foods everyday?
If not, then everythings fine.