Juliet had been technically the other woman throughout her relationship with Goodwin, much as he had insisted that his marriage to Harper was over, yet she did not care; she always knew that given the chance to leave the island and return to Rachel, Juliet would walk away from her relationship with Goodwin without a backward glance.

With James, she's finally got the chance at a future; she can finally let go of the past as Juliet Burke, will have a life as Juliet LaFleur.

Then Kate returns to the island, and Juliet sees the way James looks at her, and even though James says he's committed to her now, Juliet wonders which of them is really the other woman.