They ran away from weed because Lennie touched a girl velvet dress and she got scared and told all the other guys that she was "raped" by him so they had to run away and later they got onto a bus and the bus driver wouldn't drop them off by the ranch so they had to walk 10 miles to the ranch
Nothing bad is gonna happen to George
they arrived and they meet Candy and he shows them to their bunk house before they meed the boss.
Why did you have to get killed
Curley picks a fight with Lennie so George tells him to get him so Lennie crushes his hand
Crook is telling Lennie things like if something were to happen to George and if he doesn't get come back.
He accidentally kills the pup and Curley's wife
George shoots him so he doesn't have to suffer for the way Curley was gonna shoot him.