LeAnn Rimes – who famously had an affair with actor Eddie Cibrian while wed to Dean Sheremet — is performing new songs that focus on breaking an ex’s heart.

The country crooner, 27, took to the stage Monday at the ASCAP Music Cafe at the Sundance Film Festival, where she debuted one untitled tune.

“This song is going to make me cry,” she warned her audience. “It’s about love.” The lyrics included: “What have I done? I broke the heart of the sweetest man. What have I done? I broke the heart of the only man who’s ever loved me. Who have I become? I hope you find someone new, someone who deserves you.”

Though one source tells UsMagazine.com Rimes penned the tune “during the height of the cheating” and it is “100 percent” about her ex, another insists it “was written several years ago before the situation with Dean and the cheating. I can understand how it can be interpreted to be about what happened.”

During her set Monday, Rimes was more vocal when it came to explaining the meaning behind another song titled “God Takes Care of Your Kind.”

“A friend of mine got divorced about three years and the guy turned into a real *sshole and we wanted to kill him,” she told the audience. “Everyone gets their heart broken and wants revenge. Sometimes we sit around drinking wine and talk about it, but this song is for everyone who wants to finally get that revenge.”

Rimes, and Sheremet, 29, reached a divorced settlement in late December. The pair – who wed in 2002 – parted ways last July, four months after Us Weekly first broke news of Rimes’ affair. (Cibrian, 36, is currently in midst of divorcing wife Brandi Glanville, with whom he has two children).

Since the end of the respective marriages, Rimes and Cibrian have stepped out publicly as a couple.

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