Kevin Mazur / WireImage 1 / 5
Kevin Mazur / WireImage 1 / 5

LeAnn Rimes opened up about relationships gone wrong during her performance at the Deer Valley Music Festival in Utah Saturday night.

"It is inevitable that sometimes in a relationship, you will have your heart broken," said the singer, who has been separated from her husband of seven years, Dean Sheremet.

See photos of stars who wed too young.

"Sometimes you don't do anything, but sometimes you want revenge. Sometimes you don't, and that's when you just leave it in God's hands and know that He will take care of it," she said before breaking into her song, "God Takes Care of Your Own."

Rimes, 26, was not wearing her wedding ring on stage.

See pictures of Hollywood's ugliest splits.

On Saturday, a source told Us Rimes and Sheremet are "leading separate lives...but still in each other's lives as best friends. They are not divorcing yet, but working though things and taking time apart...while they figure things out."

Sheremet posted on Twitter shortly after: "Thanks to everyone for all the support through a very difficult time!"

See pictures of stars caught cheating.

The separation news comes the same week Us Weekly reports Rimes is still carrying on an affair with Eddie Cibrian. (Us first broke the news of their relationship in March.)

Cibrian's wife, Brandi Glanville, confirms to Us she left him as a result.

"Eddie and I have decided to take some time apart," says Glanville, mother of Mason, 6, and Jake, 2. "I want to do what is best for our children. Eddie and LeAnn [Rimes] deserve each other."