I've been reading Peter Doggett's book 'You Never Give Me Your Money' about the Beatles after the break up. I'm finding the business side of things fairly interesting, but what stuck out to me is who 'officially' broke up the Beatles. I know that they all left during certain points, but that they came back.
Doggett stated that John announced he wanted a divorce from the band during a meeting and that everyone knew that he was serious when he meant that this was the end of the band. Yet, they stayed together (even though they weren't truly together) for the sake of making money and keeping Apple and their many ventures afloat. It seemed that aside from a few people in the know as well as a reporter John told (who didn't report the news) that the Beatles seemed to be done.
Then Paul had those questions (he wrote for himself) and answered to be the promotion for his first solo album 'McCartney' which became front page news as the official announcement that the Beatles had broken up. Paul never point blank stated the Beatles were finished, but it seemed from that questioner it was over for them.
Who broke up the Beatles John or Paul? John was the one who said it in private, but depending on how much you do or don't read into Paul's answers one might think he was the one to have broken up the band once and for all.