Can anyone give me a brief summary on the relationship between Lennon and McCartney
 

I don't want any google or wiki references. I really need to know. What kind of a relationship did they share?

a sexual one. Lennon was the pitcher, McCartney was the catcher.

What kind of a sick son of bitch are you?

They were friends whose ego's were inflated daily by the media until eventually they took over, and the pair fell out, ceased working together and stopped being social. They apparently made up, but were never really friends again.