It all points to a con by either the others or by Juliet. If juliet's flashback is accurate, then Juliet is really not part of teh dharma others, and is caught in the middle. The dharma want to use Juliet to manipulate jack, and I am skeptical that Ben will let either Jack or Juliet leave the island.

I think the juliet is sincere based on her flashback, but as with all things others, i don't trust them as far as i can throw them.