Carrie Underwood is having a hard time moving on after her split from American football star Tony Romo - because he keeps calling her up.The Before He Cheats singer dated Romo in 2006 before the pair broke it off and he moved on to pop sensation Jessica Simpson.The Oklahoma-native admits she's keen to stay on the receiving end of Romo's calls, because the pair are so alike.She says, "We were both small-town people doing very big things, and we relied on each other, dealing with fame."Underwood admits she doesn't always pick up her ex's calls: "The phone will ring and it'll be him, and I'll maybe not answer."You never really know why somebody wants to be around you, or if they do genuinely like you. 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."

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