I don't think it was that he didn't want to leave the island, he just wanted to stay away from the people coming to the island, because Charlie said they weren't who they said they were. He knows Charlie died so they could get rescued, so maybe when the chance came for him to be rescued, that was why he took it...?

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*Lauren*

My favourite characters: ~Ben~ ~Locke~ ~Desmond~ ~Sayid~