Nat (Rose Byrne) and Josh (Rafe Spall) have a whirlwind romance, and get married much to their family and friends' skepticism. They predict that it won't last. A year later, the couple's marriage is put to the test when Nat is wooed by a handsome American client Guy (Simon Baker) who doesn't know she's married, and Josh entertains feelings for an old flame Chloe (Anna Faris). At the same time, each other's quirks start getting on each other's nerves. Nat is a workaholic ad executive, and Josh is often an out of work writer. Nat is sick of Josh staying home, and Josh is annoyed with Nat nagging him about the little things. Soon, the two spend more time not with each other but with Guy and Chloe. They then get couples counseling, however, their therapist turns out to be a crazy married person herself. In a weird twist, they set up Guy and Chloe on a date, but end up getting jealous when the two start flirting. Nat and Josh decide to work it out but it feels forced. When they finally decide to get a divorce, they each run after Chloe and Guy, but learn that the two have gotten together and are on their way to Paris. Stopping them from boarding a train, they declare their love for them, and apparently, Chloe and Guy feel the same way. The couples exchange partners, and kiss.
Best part of story, including ending:
Because at first, Nat and Josh seem perfect for each other, but they are two totally different people who are mismatched.
Best scene in story:
When Nat and Josh go their separate ways to look for their loves, and are surprised to see each other again at the station, realizing that they are after the same people.
Opinion about the main character:
Nat is neurotic, and sometimes harsh, so you wonder how a guy can find this attractive.