Actor Leonardo DiCaprio's relationship with Israeli model Bar Rafaeli is on the rocks and the couple has already been spending weeks apart, according to new reports.The pair began dating in December 2005, following DiCaprio's split from Brazilian supermodel Gisele Bundchen.But they have been dogged by rumours of an impending break-up in recent months - and new reports allege the Titanic actor is already moving on.According to the New York Daily News, DiCaprio was spotted in New York at the weekend cozying up to a mystery brunette, with Rafaeli no where in sight.A source says of their on/off affair, "With these two, you never know (what's going on), and they probably don't either."

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