Describe the change in personality that the narrator has undergone the great gatsby

In the beginning of "The Great Gatsby", Nick brags that he is not at all judgmental and is able to understand where people are coming from. This leads him to trusting people and thinking the best of them. By the end of the novel, after he has had so many uncomfortable and unfortunate experiences tangled up in the lives of Gatsby, Daisy, Tom, Jordan, etc, Nick finds himself to be very judgmental of their lifestyle and personalities, especially the Buchanans. He removes himself from their company and becomes more reserved, less trusting.