People conveniently forget John was married to Cynthia when the lads first started. Also, Paul was dating Jane Asher until 1966 and then dated Peggy Lipton, Jane Seymore (briefly) and a few others before meeting Linda Eastman, who was a photographer. Yoko met John in 1967. The person most responsible for the breakup of The Beatles was the Maharishi Mahesh Yogi.