You know, for a long time I wondered why Paul wouldn't reveal a relationship with John if one existed. But then, watching how people react to the very IDEA of McLennnon.... I think it's obvious and frankly very sensible. And he doesn't want the hate he'd inevitably receive (the kind YOU receive, but worse) if he "suddenly" altered people's perception of Lennon-McCartney. I 100% respect Paul's right to maintain privacy when it comes to his personal relationship details. He owes us nothing.