The light-switch romance of Leonardo DiCaprio and Bar Refaeli is off again, we hear.The “Titanic” star and the Israeli supervixen have been partying apart over the past few weeks. Refaeli appears bereft, say spies, like she’s looking for a good time but not finding it.Leo? The good times find him. The other night, at a Chelsea club, an exquisite brunette glommed onto him. (Isn’t that disgusting, guys?) But we’re assured they did not exchange phone numbers. At least in public.In fact, Bar and Leo have ridden out other tempests since they met in December 2005 (shortly after his split with his last Amazon, Gisele Bundchen, after almost five years together). The couple were said to have hit their first bump in January 2007. But, by April, British tabs had them expecting a baby and talking marriage.In October of the same year, more reliable sources confirmed that the pair were taking a breather. But they reunited shortly after Bar’s fling with surfer Kelly Slater and have stuck together through most of this year.Even now, a reconciliation may be afoot. They’ve been spotted the last couple of nights at Marquee and 1Oak. Which means you might see her on his arm by the premiere of his “Body of Lies” next month and “Revolutionary Road” in December.Says one friend: “With these two, you never know, and they probably don’t either.”

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