Tony Romo Still Calls Carrie Underwood

For a 25-year-old singer in the spotlight, Carrie Underwood has had her share of guy drama.The American Idol winner opens up in Allure's September issue about dating Dallas Cowboys player Tony Romo, Gossip Girl star Chace Crawford and a boyfriend who cheated on her in college."We were both small-town people doing very big things, and we relied on each other, dealing with fame," she says of Romo. "I don't know. The phone will ring and it'll be him, and I'll maybe not answer."

On her recent split with Crawford, she explains: "We didn't have a fight. No one cheated. It plain didn't work."One of her relationships from her days at Oklahoma's Northeastern State University could have inspired her hit "Before He Cheats.""I don't want to name names, even though he probably deserves it, but he fooled around," she says. "Oh, yeah – And lied."

Underwood says it's difficult to find friends she can trust – and guys who like her for the right reasons."You never really know why somebody wants to be around you, or if they do genuinely like you," she says. "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."Despite her first album becoming one of the best-selling country albums ever, Underwood has financial fears – and still drives the Mustang she won on Idol

"But what if I don't earn any more next year?" she asked. "What if something awful happens? I'm not at that point where I say, 'OK, I've made enough.' I don't know what the limit is."The singer maintains that she's not competitive with her country competitors. "We work harder than the guys do, because we have to!" she insists."That Faith Hill thing was a joke," she says, referring to Hill expressing shock when the Idol beat her for CMA's Female Vocalist of the Year award. "I talked to her, and she was like, 'Carrie, I'm sorry.'"Underwood's dream? "I want to have a girls-only tour and get some awesome chicks together, and have us all go out and – kick butt."