Yoko Ono and John Lennon began a relationship while he was still married to his first wife, Cynthia Lennon. The affair, of course, did nothing good for the relationship between the two women.
After Lennon and Cynthia divorced, he married Yoko Ono and began to put his son, Julian, at a distance. Cynthia didn’t think that Lennon actually stood for what he promoted in the song.