The Awakening

In Kate Chopin’s The Awakening, I found it interesting that Madame Ratignolle foreshadowed the fact that Edna Pontellier would take Robert’s actions seriously. The book explained that in the past, Robert had doted upon other Creole women, but none had truly taken his advances to mean anything. Therefore, nothing ever happened between Robert and any of the wives. However, since Edna was an outsider within the Creole ranks, she was more susceptible to his charms. Even though she at first believed the idea of Robert being so attached to her would be “unacceptable and annoying,” she eventually came to seek out Robert’s company. I believe that since Edna responded to Robert’s advances, this was the reason the relationship developed later on in the novel. Had Edna been just like the Creole women and forsaken Robert’s companionship, Robert would have gone on to develop an interest in another woman the next summer.
Question: Why is it that none of the other women responded to Robert’s advances in the same way as Edna? Is it simply because she was not a Creole or is it because she saw other men of interest in her life “melt away?”