Years before their bombshell divorce filing and the musician's recent change to the lyrics of a song, Keith Urban's ex-girlfriend had reportedly cautioned Nicole Kidman about her estranged husband. Before the glamorous red carpets, the gushing tributes, and the seemingly unshakable marriage... There was a stern warning. Long before Nicole Kidman and Keith Urban's shocking split made headlines, back in the early 2000s, prior to the duo's 2006 nuptials, an ex-girlfriend of Urban's named Laura Sigler warned Kidman of Urban's inability to commit long-term. A Love That Was Destined to Crack? Former Flame Paints a Dark PortraitThe ex — who once not only shared a romance with Urban, but an engagement — voiced serious concerns about his ability to maintain a lasting relationship. "Nicole and Keith

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