Final answer:
George tells Slim about the incident in Weed because of Slim's respectful and understanding nature, providing a sense of trust and security. This exchange signifies the developing friendship and the need for companionship in their unstable life.
Step-by-step explanation:
In John Steinbeck's novel Of Mice and Men, George confides in Slim about the incident in Weed due to several nuanced reasons. Slim is presented as a character who commands respect and has a calm, understanding demeanor. This sets him apart from the other characters, providing George with a sense of security and trust.
Moreover, the tough living conditions and the vulnerability resulting from constantly being on the move make companionship and trust essential for survival. George's decision to tell Slim about Weed is not just about needing to talk to someone but also about establishing a bond and seeking some form of stability in the precarious world they live in.
The incident in Weed is a crucial part of George and Lennie's history. George feels the need to share this backstory with Slim partly because Slim's nature as a good listener and his nonjudgmental approach create a safe space for sharing burdensome secrets. It demonstrates the developing friendship between George and Slim and also allows readers insight into George's character and his protective nature towards Lennie.