Although former American Idol sensation Carrie Underwood has become one of country music's biggest stars, fame has its downside – dating.

"You never really know why somebody wants to be around you, or if they do genuinely like you," Underwood, 25, tells Allure.

"I wish everyone had a label on their forehead so you could automatically tell their intentions. Sometimes you just wish that no one wanted anything from you."

The star recalls a time soon after her success on American Idol when a guy who'd ignored her in college – clearly enamored by her newfound success – called saying that "he wanted to explain." That's what they all say.

Fame hasn't helped create lasting relationships for her either. Earlier this year, Underwood split from Gossip Girl star Chace Crawford via text-message.

As for Dallas Cowboys quarterback Tony Romo, who now is dating a possibly (or at least wannabe) pregnant Jessica Simpson, Carrie Underwood says she still hears from the football star sometimes – but doesn't always pick up.

"We were both small town people doing very big things, and we relied on each other, dealing with fame," says the singer. "And now "I don't know. The phone will ring and it'll be him, and I'll maybe not answer."