If there are three Jack Harkness' then wouldn't, eventually they all end up working for torchwood, and meet.?
No, there's only one Jack, he just travels back and forth in time.
For example in season 2, Jack was buried by Grey (in the past), and when Torchwood (early Torchwood) found him he told them to put him in the morgue until the day he was buried and he could come back not again and not meet his former self.
Jack makes sure he doesn't meet his former/present self
hope this helps! 
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