Does Jack know what MIB wants?

Jack jumps into the water after thinking about things and deciding that if MIB wants them to get off the island so bad then maybe he needs to do the opposite. But...MIB is glad to see Jack and saves him from the Widmore's mortar attacks. So is Jack wrong that MIB wants all of them off the island? Is he playing into MIB's hands? Is Jack once again being an ass? Does MIB not know what he wants.....I am confused, can anyone clear this up????

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