Particularly, why women becomes unhappy and dissatisfy with their present status?

This question really has no right or wrong answer, it calls for your opinion. Women become dissatified for a number of reasons. In Madame Loisel's case, her dissatisfaction came from a feeling that she'd been cheated at birth. She wanted station and everything that went with it.... the parties, the nice home, beautiful clothing, luxury. She felt herself entitled to this life, thus, she was never happy with her own. Note, Madame Loisel didn't lack anything. Her husband was a good provider, she had a home, she certainly wasn't destitute in any way, shape, or form. She simply wanted more.