I think we all have our doubts about Jack now and Sun def. expressed these to Kate. I hope she smartens up and realizes that her knight in shining armor may no longer be on her side. Jack did ask about Sun's pregnancy, but Kate was the one that had to tell her about pregnant women dying on the island. Why wouldn't Jack reveal that to Sun? Doesn't he give a crap?!

Also are we to assume that Juliet's mission for Ben was to find out who else was pregnant and get their samples in order to continue with their research. Are there are missions going on as well? How is Jack involved?!

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Because all we really need to survive is one person who truly loves us. And you have her.