He needs the heart to bargain with Davy Jones for release from their bargain. It wasn't made clear what destroying the heart would do ....perhaps if Davy Jones "dies," Sparrow would still have to serve under Hammerhead Man or ShrimpFace or some other promoted member of the Crustaceon Crew.
I don't blame you for being confused. If the first film was perplexing about the precise nature of the coin curse, this one is absolutely mindboggling in its compexo-absurdity.
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