LeAnn Rimes knows she didn't handle the end of her marriage to Dean Sheremet very well--and she reveals why in the October issue of Shape magazine. Rimes, who graces the Shape cover in a red string bikini, opens up about the end of her marriage and what she's learned.

"I understand why people are disappointed in me, especially since I grew up as America's sweetheart. I think any relationship is hard to get out of, and I don't think the way I did it was right," she reveals.

"It wasn't a fulfilling marriage for either of us," she tells the magazine. "As we got older, we grew apart."

Rimes and Sheremet's marriage began to fully unravel amidst rumors she was secretly dating actor Eddie Cibrian, who was also married.