Ex-boyfriend reveals why NCIS star PAULEY PERRETTE can’t keep a man!

After an ugly di­vorce and a sham marriage, “NCIS” star Pauley Perrette is afraid to fall in love! That’s the claim of the 42-year-old actress’ most recent boyfriend – an actor 18 years her junior – who believes Pauley has trust issues with men.

“Pauley has been very unlucky in love,” Leo Geor­gallis, who dated her for several months recently, told The ENQUIRER.

“She’s one of the smart­est people I know and a true sweetheart, but I believe she’s been damaged by past relationships. Now she just doesn’t know how to trust.”

Pauley, who plays bril­liant forensic specialist Abby Sciuto on the hit CBS series, blew up her first marriage to musician Coyote Shivers when she cheated with a pizza delivery boy in 2004.

She eventually moved former Papa John’s driver Michael Bosman – who was about 13 years her junior – into her home while her split from Shivers turned ugly.

Pauley obtained a restrain­ing order against her ex and accused him of raping a friend of hers – charges that Shivers publicly denied in a video that he posted on YouTube.

She supposedly wed pizza boy Bosman on Feb. 14, 2009, at the Hollywood United Methodist Church in what the couple called a “ceremony.”

But The ENQUIRER could not locate a marriage license or divorce documents for the couple, and her ex-hubby calls it a sham.

For the full story – it’s ONLY in the new ENQUIRER – on sale now!