The cause and end of the time loop in Groundhog Day (1993)

What caused the time loop of Groundhog Day (1993) is the cynicism of Phil Connors and the weather storm he wrongly predicted that trapped him and his coworkers in the town of Punxsutawney, Philadelphia. Phil Connors constantly relives the same day and experiences highs and lows while trapped in this time loop. What ends the time loop after several suicide attempts, correcting his wrongs, or seducing Rita? Is it the homeless man that lets him see the value in everyone's life rather than his own? He desperately tries to save this man but can never seem to catch him in time. He finally discovers that the only way to interrupt this time loop is through self-reflection on his life and the people around him.