Answer:
The protagonist of the story. Mathilde has been blessed with physical beauty but not with the affluent lifestyle she yearns for, and she feels deeply discontented with her lot in life. When she prepares to attend a fancy party, she borrows a diamond necklace from her friend Madame Forestier, then loses the necklace and must work for ten years to pay off a replacement. Her one night of radiance cost her and Monsieur Loisel any chance for future happiness.
Hope this helps.
