Reason for the break-up of the Beatles

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It has been decades since the fab four separated ways to chart their own unprecedented professional careers. It has been decades that their fans have longed for a reunion concert that will now never materialize after that fateful day when John was shot to death by a psycho who thinks that he's the real John Lennon. However, up to now, I don't now much on the reason on why the fab four broke-up. Was it really because of Yoko Ono and that Paul was utterly disgusted with her? Will you guys help me know the real truth about the reason/s of their breaking up.