updated 11/03/2010 AT 2:50 PM ET
•originally published 11/03/2010 AT 1:30 PM ET
“That’s just not me. What happened is not who I am, period,” the country star, 28, tells ABC’s Robin Roberts of the affair with her Northern Lights costar in a special titled All Access Nashville, airing Wednesday night.
But Rimes isn’t dwelling on the past. “I do know how much I love him,” she says. “So, I’ve always said I don’t live my life with regret. I can’t.”