People Magaine is reporting that the year-long romance of John Mellencamp and Christie Brinkley has reached its end. A rep for the couple told the publication that career demands and the distance between their respective homes make it impossible for the relationship to continue but says both intend to remain very close friends. When last asked by People about the prospect of marriage, Brinkley had said, 'You never really know what's going to happen. John and I are two people that have very full lives. We're just trying to enjoy each other when we can see each other.'