Some days, you win. Some days, you lose. And some days, it rains.
The rest of the movie involves, in one way or another, a three-way contest to see (a) who really loves whom, (b) who really can trust whom, and (c) whether the answers to (a) and (b) involve the same two people.
Meanwhile, we're getting to know some of the other members of the team and management, in a low-key, Robert Altman-style directorial approach that fills up the background with a lot of atmosphere and action.
The movie is a completely unrealistic romantic fantasy, and in the real world the delicate little balancing act of these three people would crash into pieces. But this is a movie, and so we want to believe in love, and we want to believe that once in a while lovers can get a break from fate. That's why the movie's ending is so perfect. Not because it seems just right, but because it seems wildly impossible, and we want to believe it anyway.