Final answer:
Stella decided to go home because of the toxic environment with her husband. The reunion of Desiree and Stella had conflicts due to Stella's conflicting loyalties. Stella didn't stay longer because she chose her safety and well-being.
Step-by-step explanation:
Stella finally decided to go home because she couldn't bear to stay any longer in the toxic environment with her husband Stanley. The reunion of Desiree and Stella is a complex one, as Stella is torn between her loyalty to her sister and the love she feels for her husband. Stella didn't stay longer because she ultimately chose to prioritize her own safety and well-being.