Character Growth + Character Relationship Change

Character A calls Character B a fat moron for crashing his car.
Character B is now setup for growth.

Character B signs up for the gym.
Character B meets Character C at the gym.
Character B is now setup for Character Relationship Change.

End of Movie - Character B understands why he crashed the car. Perhaps it's not even because of his weight.  With help from Character C and Character A is now out of his life.