moral lesson?

I think a moral or lesson might be "don't cheat on your spouse" but this a rather simplistic interpretation of the story. Examining theme would be better way to examine the text. In "A Respectable Woman," Kate Chopin delves into the psychology of Mrs. Baroda, a wealthy woman with a loving husband who faces temptation in the person of Gouvernail, a polite, unassuming visitor to the Baroda plantation. Like the heroine of "A Pair of Silk Stockings," Mrs. Baroda is enticed early in the story with the prospect of a change from a quieter, more ordinary life, but whereas Mrs. Sommers gives in to her desires with relative ease and begins spending her extra money after limited deliberation, Mrs. Baroda does not instantly recognize what she really wants and eventually struggles with the self-imposed limitations of her identity as "a respectable woman."