Ben said this to Juliet right after he said "Jack trusts you". Then Juliet appears to be wandering in her thoughts...what could this mean?

Perhaps she is second guessing the mission??...perhaps she feels it really isn't right to take advantage of trust....perhaps thinking of the moral impropriety of activating Clairs implant to cause sickness...???

What do you think? Will this be a clue that she might pull a switchback in the end?...doublecrossing the others...

Also after she tells Ben "Im fine" Ben looks at her for a significant few seconds ...almost to make sure she isnt having second thoughts or if she's really 'with us' on this...know what I mean?

Wadda ya all think?

It's always possible that Juliet could be a couple of steps ahead of him.
But as Ben is generally at least ten steps ahead of everyone else, I'm sure he's already thought of that.

In a previous episode, Ben told Jack that Juliet is one of them and will never side with Jack (said in the exam room at Hydro)...I'm not so sure about that.

The introspective look that Juliet gave to Ben that caused him to say "are you alright" also made me believe that Juliet may have a surprise in store for Ben.

I think that the producers want us to believe that by showing us the flashback with Ben and Julie...that she is a plant and is with our Losties to kidnap Aaron or Sun...but once again, I'm not sure that's going to happen.

Juliet wants off of the island and I think she has already come to grips with the fact that Ben is NEVER going to let her go.

I think her only chance is to build an alliance with our Losties (and especially Jack) and use her knowlege of what's going on to figure out a way off the island.

Anyway...I agree with that comment by Ben being very interesting...almost like he also noticed her hesitation once he mentioned Jack...maybe questioning his own belief that she will never choose Jack's side over the others.
100%
It's always possible that Juliet could be a couple of steps ahead of him.
But as Ben is generally at least ten steps ahead of everyone else, I'm sure he's already thought of that.

Ben has been duped before though. he's not as sharp as everyone thinks or he would not have been captured by the losties and tortured.

His plan was also shot when Hurley figured out that Ethan was an other.

I'm sure that there are other examples but those are 2 big ones. Ben could be duped again...soon.