American Idol hopeful Casey James said "I don’t" to marriage and chose music instead, according to his ex-wife who tells ALL to The ENQUIRER in an exclusive interview.

And even though Idol judge Kara DioGuardi has gone cougar on him, the long-haired rocker doesn’t consider himself a heartthrob, she says.

"Music is everything to Casey," said his ex-wife Kellie James, 31, a respiratory therapist who was hitched to the singer-songwriter from 2005 to 2008.

Kellie says his drive for success put stress on their relationship, and in the end it cost them their marriage.

Now 27, the Texas guitarist had some wild years in his late teens and early 20s when he served two stints in jail for driving while intoxicated, driving with an invalid license and reckless driving.

But Kellie claims he’d settled down by the time they met at Leaning Tree Church in Mineral Wells, Texas.

"It’s a very contemporary church, and Casey gravitated toward the musical people in the congregation. Eventually, he played and sang in the praise-and-worship band," Kellie divulged in an exclusive interview.

"Church is still very important to him, and he plays music for a congregation in Fort Worth, where he lives now."

"Idol" judge Kara swooned when Casey shed his shirt at his Denver audition, and gushingly called him not only "eye candy," but "ear candy" during his first live performance on the FOX show Feb. 24.

Despite his good looks, Casey’s ex-wife insists that he doesn’t have a wandering eye.

"Girls have always had crushes on him, but Casey doesn’t encourage it. He’s not conceited or full of himself," Kellie said.

"He just does what he loves to do, which is music, but he’s never thought of himself as a heartthrob. Frankly, I think it embarrasses him."

A devoted Kellie was at Casey’s hospital bedside after he fractured his left wrist and right femur in a near-fatal motorcycle crash. The accident left him in a wheelchair for six months, and nearly ruined his music career.

"The doctors told us that they didn’t know whether Casey would be able to use his hand again, much less play the guitar," revealed Kellie.

"When he was finally able to play again, Casey felt he had a new lease on life."