Ouch! Just two months after filing for divorce from husband Brad Pitt, Angelina Jolie's ex Billy Bob Thornton is opening up about his relationship with the famous actress.

In an interview with GQ, the 61-year-old actor revealed the real reason behind their divorce in 2003, after falling in love on the set of the movie Pushing Tin in 1999.

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"I never felt like I was good enough for her,” he said, referring to his disinterest in her work with the United Nations.

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The couple, who famously wore vials of each other's blood around their necks, split shortly before Angelina adopted oldest son Maddox from Cambodia.

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Billy Bob is now married to his sixth wife, Connie Angland, and the pair share 12-year-old daughter Bella.

Meanwhile, Angelina, 41, is the [midst of a custody battle]( with Brad, 52, over their six children, Maddox, 15, Pax, 12, Zahara, 11, Shiloh, 10, and eight-year-old twins Knox and Vivienne.