The surprising reason Will Smith wanted to be famous

Will Smith accepts the Hollywood Actor Award for his role in the film "Concussion" at the Hollywood Film Awards in Beverly Hills, California Nov. 1, 2015.

Mario Anzuoni/Reuters

A major catalyst pushed Will Smith to want to become famous -- and it may surprise you.

The 47-year-old recently actor sat down with Benicio del Toro for Variety's "Actors on Actors" series and opened up about a lot of things, including his new film "Concussion" and why he sought fame as a teenager.

"When I was 15, my girlfriend cheated on me," he said. "And from that moment, in this bizarre psychological twist, I wanted to be the most famous entertainer on Earth because I believed that your girlfriend couldn't cheat on you."

The former "Fresh Prince of Bel-Air" star called his reasoning a "bizarre psychological leap" -- something that he looks for in characters he plays on the big screen.

"Concussion" opens in theaters on Dec. 25.