Curley thinks that Lennie was laughing at him (when he wasn't) and he has been wanting to pick a fight with Lennie because he dislikes people taller than him because he isn't very tall himself.
Because he is told to by George after he does not retaliate instictively when he is punched by Curley.
Curley was in the bunk room beating up Lennie. Curley was looking for his wife and saw Lennie laughing. Curley thought Lennie was laughing at him when he really wasn't. Curley then started to beat up Lennie while George is screaming to Lennie to fight back. Lennie then grabs Curley's fist as he is about to punch him again, and Lennie crushes Curley's fist. The damage to Curley's fist was so bad he was taken to the hospital. Slim forces Curley to say his hand was crushed by a machine. There were hardly any bones left in Curley's hand, and Curley was crying.
Curley beat up Lennie in "Of Mice and Men" out of anger and jealousy. Curley was upset over his wife's flirtatious behavior towards the ranch workers, including Lennie. Being a small man, Curley also took out his frustrations on Lennie to assert his dominance and power over him.
Curley dislikes Lennie because he sees him as a threat or challenge due to his size and strength, which makes Curley feel insecure about his own authority. Additionally, Curley's possessiveness and jealousy of his wife make him suspicious of Lennie and ultimately leads to their confrontation.
Curley attacks Lennie out of rage and insecurity. He is a small man who feels threatened by Lennie's size and strength, and he targets Lennie in order to assert his dominance over him and prove his own toughness to the other ranch workers. Curley's aggressive behavior reflects his own feelings of inadequacy and a desire to prove himself.
George tells Lennie to fight back and defend himself if Curley hits him. George wants Lennie to stand up for himself and not allow others to take advantage of him.
George wants Lennie to stay away from Curley and his wife because he knows that Lennie is not able to understand social cues and may inadvertently get into trouble, especially with someone as volatile as Curley. He wants to protect Lennie from dangerous situations and avoid any conflict that could jeopardize their dream of owning a farm.
If you're talking about the book 'of mice and men', they pretty much hate each other;In one scene, Curley beats up Lennie for no real reason, George tells Lennie to fight back, so Lennie does, not meaning to break/seriously injure Curley's hand. After this incident, Curley hates Lennie, (obvious) and hates George for being Lennie's friend, and not being on Lennie's side.Something that doesn't help their relationship, is how protective Curley is over Curley's wife. Curley's wife is very flirtatious, and tries to have conversations with both George and Lennie. Curley hates George for flirting with his wife, even though it wasnt his fault. He is also too strict with his wife, which makes her go looking for even more trouble.Near the end of the novella, Curley's wife tries to talk to Lennie in the barn, but they get into a bit of trouble, by Lennie accidentally killing her. he then runs away, knowing how much trouble he will be in with everybody. When Curley finds out what happened, he automatically blames Lennie without proof, so therefore hates George even more.Hope this helps, and if you watch the film, it should be a bit clearer.
He took an arrow to the hand.
In Chapter 4 of "Of Mice and Men," Crooks is visited by Lennie, Candy, and later Curley's wife. They end up in Crooks's room after Lennie is forbidden from entering the bunkhouse by the other men. Each character is seeking something different - Lennie wants companionship, Candy wants a sense of belonging, and Curley's wife wants to alleviate her own loneliness.
George tells Lennie to avoid getting into trouble with Curley, the ranch owner's son, and to stay away from him as much as possible. George warns Lennie to be cautious around Curley because he is known to be aggressive and easily provoked.
Curley's wife visited Crooks, Candy, and Lennie in the book "Of Mice and Men" by John Steinbeck. She went into Crooks' room looking for Curley and ended up talking to the men there, revealing her loneliness and desires.
Lennie kills Curley's wife by accidentally breaking her neck while trying to calm her down after she panics and screams. Lennie, who does not know his own strength, becomes scared and tries to quiet her but ends up causing her death. His actions are unintentional and driven by his inability to control his strength and emotional reactions.