Sexy thriller Eyes Wide Shut ended Tom Cruise and Nicole Kidman's marriage because the couple's characters were too close for comfort, according to a new Kidman biography.

In his new study, Nicole Kidman, film historian David Thomson claims the former couple held a mirror up to their relationship issues when they signed up for the 1999 Stanley Kubrick film.

Thomson says, "I think she learned from him just what was required in taking charge of yourself. That's what broke them up. She realized she could be as big as him if she became as strong and self-centred. He wanted a beautiful, bright, obedient consort. She wanted a teacher. It worked. Then it stopped. I think Eyes Wide Shut was the process that brought it to an end because the characters they played were so close to themselves."

(This news article provided by World Entertainment News Network)