this has something to do with jim exposing hucks personal life.
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The most powerful scene occurs when Huck writes a letter to Miss Watson explaining where Jim is, only to tear it up, accept his fate no matter what the consequence of following his conscience, and set out to free Jim. Huck is willing to sacrifice his soul for Jim's freedom, showing a tremendous amount of personal growth. This scene indicates how his relationship with Jim has changed over the course of the journey downriver, from companion, to respected friend, to the only family Huck will acknowledge. Huck decides to free Jim after remembering all the times Jim protected and cared for him, something which no one else has ever done for Huck.