Ending was atrocious. Possibly worst ever.
It's absolutely clear that she is miserable with her husband and is in love with Adam Scott's character. The film gives us no evidence that she even cares about the husband anymore. Sneaking off to read Jason's letters, pretending to be asleep to avoid him, ignoring his calls, dodging him at work... but then her brother shows her the proposal video and all of a sudden she just goes back to him?
Yes I understand that the film was drilling into our heads that Jason was this lovesick semi loser who needed to move on from the past, but we were given NO evidence whatsoever that she wasn't in love with him, she drove all the way home, made everything perfect, kept all of his letters etc. This just makes the ending that much more stupid.
If she didn't end up with Jason, I would have rathered her end up with neither of them than that bs.