You two are such a mismatch when it comes to what's important to you in life that you probably shouldn't have come together as a couple in the first place. You're just on two completely different pages; you're not even opposed, like an atheist and a priest or a war protester and an Army general; you're more like...a kangaroo and a generator. A mathematician and a fisherman.
You're just apples and oranges, and you aren't able to understand the other's passion for their ideals and vocation. There's not much to say about this kind of mismatch; it just probably shouldn't happen. You both realize that it's just not going to work. You're too different! No sense in beating a dead horse, trying to make something happen that just isn't meant to be; you might both just want to move on, instead, and look for someone who's a little more on the same page as you are.