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Came across this:

http://www.popeater.com/music/article/who-cheats-on-carrie-underwood/130061

On a Cheating Boyfriend: "I don't want to name names, even though he probably deserves it, but he fooled around. Oh, yeah, and lied! It was one of those things that everyone knew but me. He was a good liar. Nobody would come out and tell me. And he seemed perfect in every way. I'm sure we've all run into these people, whether they're friends, boyfriends or girlfriends."

So Carrie claims to have been in the same boat.