Jersey Shore's Ronnie Ortiz-Magro, Sammi Giancola Split

It was fun while it lasted.

After two tumultuous years together, Jersey Shore couple Ronnie Ortiz-Magro and Sammi Giancola have called it quits.

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"We are not together," Ortiz-Magro confirmed to Us Weekly at Tuesday's Paranormal Activity 3 superfan screening in New York City.

Following an explosive spat seen on Jersey Shore's third season in fall 2010 -- he stomped on her glasses and called her a "spoiled bitch," leading to a breakup -- the pair reconciled to film their fourth season in Florence, Italy.

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"Being in Italy, in such a romantic atmosphere, brought us together," Ortiz-Magro told Us prior to the show's August premiere. "The first week was rough -- everyone was like 'Oh, my God.' But [Sammi and I] didn't fight at all in Italy. [It was] probably the highest point in our relationship."

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Jersey Shore's Paul "Pauly D" Del Vecchio -- who saw the couple fight, break up and make up during the show's filming in Florence, Miami and Seaside Heights, N.J. -- tells Us he prefers his pal single.

"I love single Ronnie," Del Vecchio says. "When he's doing the relationship thing, I let him do his thing, I don't get involved. When he's with Sammi he's a different person. She's a difficult woman!"