why does lennie leave curleys wife in the barn
After accidentally killing Curley's wife in "Of Mice and Men," Lennie flees to a nearby hiding spot in the brush by the Salinas River where George had instructed him to go if he ever got into trouble.
If you mean the dead mouse from the beginning of the story, then because Lennie had his pants wet and George threw the mouse in the lake. George also knows Lennie too much, since they've been together for a long time, and assumes that he went to look for it.
If George and Lennie get in trouble, the plan is to meet at their designated spot by the river and wait for George to come get Lennie. They have a backup plan to flee and seek refuge at a nearby ranch where they have employment waiting for them.
Lennie died next to the Salinas River in "Of Mice and Men" by John Steinbeck.
One example of foreshadowing in "Of Mice and Men" is when Lennie accidentally kills the puppy, foreshadowing his eventual accidental killing of Curley's wife. Another example is when Candy's old dog is shot, foreshadowing the fate of Lennie at the end of the novel. These events hint at the tragic outcomes that will unfold later in the story.
Throw it across the river
Told him to hide in the brushes where they slept
George told Lennie to flee to the clearing by the river and wait for him to come get him, if Lennie got into any trouble. George and Lennie spent the night in the same clearing on their way to the ranch/farm.
He wants to keep it, pet it, and name it George.
Lennie's plan to avoid getting in trouble is to hide in a secluded spot by the river if he ever finds himself in a difficult situation. This spot is a safe place where he can go to calm down and wait for George to come back and help him navigate the situation.
Lennie imagines his Aunt Clara and a gigantic rabbit talking to him while he hides by the river. They scold him and warn him about the trouble he causes George.
George realized that his actions were hurting Lennie's feelings and damaging their friendship. He decided to stop playing dirty tricks on Lennie because he cared about him and wanted to maintain a positive and trustworthy relationship.