More than anything else, I think that he is singing about uncertainty within their relationship. There is an underlying fear of what could happen; he suspects the worst.
He has to tell the girl not to look back, to not to regret coming with him in the first place. They're going away together on what seems like a romantic trip, but she isn't feeling it. He knows this, but would rather ignore this existing malaise and enjoy the excursion.
Note that "the house is white, but the paint is coming off." Not only are they physically going somewhere, they're also going to a new place in their relationship. This place is where what once was good (white) is slowly being removed.
More than anything else, I think that he is singing about uncertainty within their relationship. There is an underlying fear of what could happen; he suspects the worst.
He has to tell the girl not to look back, to not to regret coming with him in the first place. They're going away together on what seems like a romantic trip, but she isn't feeling it. He knows this, but would rather ignore this existing malaise and enjoy the excursion.
Note that "the house is white, but the paint is coming off." Not only are they physically going somewhere, they're also going to a new place in their relationship. This place is where what once was good (white) is slowly being removed.