The most essential line of communication in the Beatles ran between Lennon and McCartney, and now that was interrupted, in both emotional and physical terms. McCartney felt judged, excluded, rejected. His partnership with Lennon was non-sexual, but it ran deeper than anything he had ever experienced with a woman. It underpinned his self-belief and his status in the world. Seeing Lennon focus on Ono rather than him was as devastating as it would have been for Cynthia Lennon to witness the couple making love.
— Peter Doggett, “You Never Give Me Your Money”