"We were drifting apart and not really spending any time together," Magro told PEOPLE at the premiere of former costar Jenni "JWoww" Farley's new film, Jersey Shore Massacre, out Aug. 22.
After splitting and rekindling their romance several times on the show, the couple finally parted ways two months ago, he says.
"I still care about her," he said, adding that he's not ready to date again. "She's a great girl, but we were growing distant. It was for the best."
For now, Magro says, he's getting practice for his own future family playing uncle to JWoww's 5-week-old daughter Meilani, with her fiancé Roger Mathews.
Adds Magro: "She's really squirmy and looks just like Roger!"