'Jersey Shore's' Angelina no longer engaged

David Kovaks says it's off after he got text from firefighter apologizing for sleeping with Pivarnick.

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Looks like Angelina Pivarnick is going to be a single mom.

The 24-year-old "Jersey Shore" star, who announced her pregnancy earlier this week, is no longer engaged to David Kovacs, who popped the question with a $60,000, 2-carat diamond ring in February.

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"I'm going through a really tough time right now," a somber Kovacs tells Radar Online. "I have ended things with Angelina."

VIDEO: Angelina gushes about

What went wrong? "I got a text from a firefighter who actually apologized for sleeping with Angelina saying he just found out she was engaged," he explains, adding that he "actually found a pair of guy's underwear in her car."

Despite their recent split, Kovacs says he'll always have a special place in his heart for the MTV star. "I truly fell in love with this girl and wanted to have a family and grow old with her," he admits.