Things I do not like... :/
VETTER: You make it sound as if they were never really close.
KLEIN: I can only tell you what John said when I asked him who he would call among the Beatles if he was in trouble-you know, if he had a real problem. He said he’d call George. That surprised me. Then I asked him if he’d ever been really close with Paul and he said no. Not that he didn’t love him; he did. He just said every time he let his guard down, McCartney hurt him.
VETTER: Did he say how?
KLEIN: Not specifically. But you know, it’s the kind of hurt where you open up to someone, really reach out, and then they’re just not there. A couple of times I thought Paul and I really had something going and then the next day, it was like it all just slipped away.
”
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Allen Klein, Playboy: A candid conversation with the embattled manager of the Beatles. (November, 1971)
I don't really like this!... I wouldn't know to say how reliable Allan Klein is. Looking at the date I do believe that's something John might have said. Which then again makes me wonder what on Earth happened between them that he turned so sour on Paul.
P.S. The credit for this goes to crosshair, who posted it in her amoralto blog.