Cover girl: Model Bar Refaeli celebrates her appearance on the cover of the Sports Illustrated Swimsuit Issue in New York.
'Erin's playing the perfect low-maintenance girlfriend, but Leo's going to get bored with that fast.
'He loved Bar's feistiness and her ability to stand up to him. She was the only girl who was able to drag him home to play dutiful boyfriend. He wanted to marry her and even considered converting to Judaism for her,' said the source.
Refaeli finally called it quits with Leo May 2011, and DiCaprio didn't quite realise it was for good because they had split so many times.
When he heard she had started seeing other men, he reacted by going on a womanising rampage.