question about miles?

In "There's no place like home" ( I forgot which 1).Miles says to Charlotte "I can't believe your willing to leave after all that time u spent trying to get back here"(not is exact word). She then says "what do u mean getting back here", and he says, "uumm...what do i mean". This is implying that miles knew that she had been on the island before....the question is how?...and in "This Place Is Death"..charlotte told them that they should look for the well to find the orchid station...when they found it miles said "How the hell did charlotte know that this was here?"..If he knew that should had been on the island before then why was he so surprised?....

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