All these are theories and may or may not be reasons why the most fab band broke up. We don't honestly think anyone can exactly say why, except the guys themselves.

One:
Things started to change when the fab four had made the decision to quit touring in 1966. When they were on the road the guys kept a closeness to one another by sharing hotel rooms together. When the tour ended the closeness of the fab four started drifting away and they began doing their own projects by themself and doing their own things without the others.

Two:
When The Beatles went to India to meditate in 1968, Ringo and Paul weren't into the meditation thing and stayed a very short time in India while John and George enjoyed their time in India to study meditation and stayed for months. This showed how the guys were now no longer into the same thing anymore and were started to draw further and further apart.

Three:
Two words: YOKO ONO! I know most people believe she did not cause the breakup of The Beatles, but you have to admit having an annoying chick in the studio while the band was having issues with one another didn’t help much! She literally pissed off the other three Beatles being there. Yes, a breakup would have happened sooner or later between the fab four, but there is always the what ifs. If they continued to tour, would they have stayed close to one another? If The Beatles didn't do the meditation in India, would the guys have known they were starting to go their own separate ways? If John would have never met Yoko, would the band have worked out their differences while recording once again? Too bad we'll never know what would have happened if those things actually happened. There is one thing we can say at least: The Beatles will always be remembered and loved forever!