"When I was 15 years old, my first girlfriend cheated on me. And I remember making a decision that nobody would ever cheat on me again. And the way I was going to do that was by being the biggest actor on Earth... So there's been this weird psychology that I have always felt like: 'If my movies are number one, my life is going to work out great'." Will Smith on the drive that fuelled his early film successes.