Much like in the story of Madame Bovary by Flaubert, Maupassant's character Mdme Loiselle grew up expecting that her life would turn into everything she ever dreamed of.
Also, similarly to Mdme Bovary, Mdme Loiselle's husband was aware of the dissatisfaction of his wife. As husbands, both Bovary and Loiselle felt responsible for the mental condition of their wives. The men are meant to be providers, and the anchor of the household- if the wife is not happy, is proportional to the ability of the head of the household to provide.
Hence, both husbands in both stories came upon a chance to somehow provide their wives with a chance to reach that summit which they so much dreamed about: A brush with glamour.
Monsier Louiselle felt that, as a result of the invitation, hewould have finally been able to please his wife's dream of glamour. Unfortunately,she was already way too submerged in her own fantasy world to appreciate what he did for her.
Madame Mathilde Loisel is dissatisfied with her life. She was educated with women who had become wealthy while she had become poor. When her children are ill, she even has to attend to their nursing without getting help as well as to attend to the running of the household. This doesn't sound unusual to some in the current era, but it was unusual and bespoke a poor lifestyle in 1884. When Monsieur Loisel announces the invitation to the ball, Madame is struck with horror because, in their poor living conditions, she of course has no gowns appropriate for a ball. This sounds trite, and perhaps she was being small minded, but it was also true that appearing at a social event improperly clothed would gain social censure instead of social welcome. In other words, she'd have been a social outcast if she went to a ball in an everyday gown.
Monsieur Loisel isn't thinking of this aspect of social requirements. He is thinking about the fact that now his wife will have an opportunity to associate with the kinds of people that she was used to and misses. He is also happy for himself because the invitation means he is being marked out for advancement. Advancement in his career will eventually lead to a wealthier lifestyle, which is what his wife wants. These are the reasons Monsieur Loisel expected his wife to be happy.
M. Loisel expects that his wife will be pleased to get this invitation because Madame Loisel is so interested in living a life that is more high class than the one that she now leads.
The main character trait of Mme. Loisel is the fact that she aspires to be richer and more socially prominent than she is in real life. Her husband would naturally, therefore, assume that she would be delighted to go to a social event hosted by someone as high up in government and society as the Minister of Education.
M. Loisel's husband is aware that his life is disappointed at the level in which they lives and the things that they do not possess. He is excited to tell her of the invitation because he believes she will be happy that she will be attending a higher class function. He knows that she will see it as an opportunity to mingle among the class in which she feels that she belongs. Her Husband gets the opposite reaction than what he had expected because she is distraught about not owning the level of clothing and jewelry that will allow her to present like she is one of the class of people who will be attending the event.