Yea, guess this contains spoilers... but the film does the best job of accomplishing that all on its' own. It starts off they're together for six years, and are both obviously unhappy, or bored, or whatever. She tells him that she can't talk to him because he won't listen. So with that justification she informs him she has previously had sex with a co-worker. He walks out on her over this revelation. Then there are a couple other relationship story lines in the middle of the film, just filling up screen-time.. none (but one) of which we care much at all about. Towards the end of the movie once again she hooks up with that same co-worker (rocks-off only). Then several minutes later in the film, she goes home and unexpectedly runs into the ex, and not long after they decide they are going to 'give it another chance,' because they really 'love' each other. Oh to be the fly on the wall once those latest hook up announcements see daylight. Obviously this storyline made some semblance of sense to somebody.. but to a majority of the rest of us we really are not made enough to actually care.