George is very annoyed by the way Lennie acts. Lennie drives George crazy when he keeps on collecting dead mice and George can't keep his cool and lets out his anger on Lennie which causes him to cry.
Lennie and George were looking for water and came upon a river. They both tried the water but then realized that it wasn't moving water. George told Lennie that water that isn't moving is not safe to drink.
George and Lennie move to get a job because no one from the last town understood Lennie's sitiation. George is very mad for having to move out all the time just because of Lennie