I think it was, John Lennon chose Yoko Ono over the Beatles.
I think they were already broken up before the time they announced that they were-- I think John Lennon wanted to officially anounce it some years before, but-- was it Paul McCartney? He didn't want to, but I think, he was the one who made it real later, without permission or something-- or maybe without notice I should say.
I think John Lennon felt that the Beatles were becoming fake, and the public had this image of him that wasn't really him, so he showed them that it wasn't just fame he was seeking, or public approval. He was going for something higher, or different.
Also Yoko Ono, John Lennon called her "Mother"-- it's said she was the one who saved him, or became his best friend, when he cried Help!.
John was so attached to her that he took her to their band sessions. It was an unspoken rule that no one but the Beatles members would come to those gatherings, but he took her, and I don't know if he gave her a choice.. she probably felt uncomfortable.
People continued to not like her, even when John was with her. She was this advant garde artist, and she had this sculpture, and the people at the gallery didn't even take any precautions that it not fall down. No rope or anything. And when they walked in, there was hostility... so John and Yoko just sat on the stairs, and people kinda stepped over them or something.
I read a book called Memories of John Lennon-- or I think that's what it's called. It was edited and put together by Yoko Ono... nice book, artistic (ha! : ) People who were connected to them (well, to John) gave their memories and reflections on how the Beatles (and John) affected them... maybe it would be a good read for you.