You don't always get the dream house,
but sometimes you get awfully close.
And in this moment, he's about to go off and marry the wrong girl, clearly indicating that he's not in love with his almost wife, he loves Jenna, the star of the movie. But he chooses to settle for second best.
When you can see what's right in front of you, that thing/person/dream job/whatever, that is your 'dream house', why would you ever settle for anything less than that?