The Hollywood beauty's complicated love life was only resolved when she found the courage to leave long-term partner Statham for the Titanic hunk in August 2004.
She says, "I was scared to leave the nest I'd built with Jason, so I'd probably stayed too long.
"If you start finding someone else attractive when you're already in a relationship there's a reason for that."
But the SMALLVILLE star maintains the pair would have split anyway.
She adds, "I wasn't happy. I'd been with Jason since I was very young and I knew I needed to branch out on my own.
"It just so happened there was somebody else there, but it would have occurred anyway."