Why did Judy leave Dexter in winter dreams?

In F. Scott Fitzgerald's "Winter Dreams," Judy Jones leaves Dexter Green primarily because of her whimsical and capricious nature. Despite Dexter's deep love for her and his aspirations for a future together, Judy is ultimately more interested in the thrill of excitement and the allure of wealth than in a stable relationship. Her desire for freedom and her tendency to be drawn to other suitors lead to Dexter's heartbreak, highlighting the transient nature of their connection.