Eva Simpson & Caroline HedleyKATIE Melua has spilled her guts about the split from The Kooks' Luke Pritchard, in song.The 21-year-olds met in 2000, but despite discussing marriage, they split four years later.In her new single It's Only Pain, out next month, she trills: "It's only pain, it only hurt, I'm down on the floor where I've been before."Advertisement