Might jus' as well spen' all my time tellin' you things and then you forget 'em.
Chapter 3 - 4
George and Lennie run away from their job, due to unfortunate events... Therefore, they go out and get a new one.
George and Lennie meet many different people with many different traits and characteristics, as a result of their new job. George doesn't want Lennie to mess up this job for them, so he forbids Lennie to talk.
Lennie was messing around and accidently killed Curly's wife. It didn't settle well with the bunk... George and Lennie had to runaway once again.
George got tired of watching Lennie, and letting him ruin every job they get. George shot Lennie.