LeAnn Rimes is comparing her recent bouts of depression to "a roller-coaster ride."

During an interview with ET, the stunning 30-year-old country superstar tells Nancy O'Dell:

    "All of the emotions that you feel ... it's like a roller-coaster ride. Every emotion changes. What you have to learn to deal with is you have to learn how to ride the roller coaster. So I think where people end up doing something so drastic is when they felt like there's no ride to take anymore."

As for whether she fears infidelity will occur in her current relationship with hubby Eddie Cibrian, LeAnn adds:

    "I would be ignorant to say, and everyone else would think I am a liar if I didn't say yes, and I have at times."

LeAnn's album Spitfire is due out April 30. Two emotionally powerful singles have already been released ... "Borrowed" and "What Have I Done."