Lennie loved when George told him about how different they were from the rest. They had each other and that's all they needed. George talks about how they are going to get a house and Lennie would finally be able to tend the rabbits.
George told Lennie that he had to behave on the farm and not say a word when they were asked questions. George didn't want to get fired again, he wanted to earn money so they could buy a house.
Lennie was doing a good job on the farm, he followed the orders he was given. Curley was the only one that was giving Lennie a hard time. He bullied him and then fought him. Lennie didn't want to hurt him but he needed to defend himself so he broke Curley's hand.
Lennie went to the barn to go and play with the pup but, accidentally killed him. He was devastated because he didn't mean no harm. He knew if George found out he wouldn't get to tend the rabbits, so he decided to hide it from him.
Curley's wife saw Lennie in the barn and decided to go to him. She saw that he killed the puppy and tried to make him feel better. After talking she let him touch her hair but he started to act rough with it. She began to panic so Lennie shook her so much in order to quiet her that he broke her neck and killed her. After realizing what he did he ran away.
Once Curley found out he told everyone that he wanted him dead, they all went after him. George knew where Lennie was hiding and ran there. Lennie apologized and said that he didn't mean to hurt anyone. George sat him down and talked to him about the dream that they had and him getting to tend the rabbits, he then shot him in the back of the head with Carlson's gun.