Hancock

'A hard-living superhero who has fallen out of favor with the public enters into a questionable relationship with the wife of the public relations professional who\'s trying to repair his image.'

Hancock is a 2008 American action-comedy superhero film directed by Peter Berg and starring Will Smith, Jason Bateman, and Charlize Theron. It tells the story of a vigilante superhero, John Hancock, played by Smith, from Los Angeles whose reckless actions routinely cost the city millions of dollars. Eventually one person he saves, Ray Embrey, played by Bateman, makes it his mission to change Hancock's public image for the better.

Source: Wikipedia