Why does mathilde hide the truth 'The Necklace' by Guy de Maupassant?

Mathilde hides the truth about losing the necklace because she fears the shame and judgment that would come from admitting her mistake. She is deeply concerned with her social status and appearance, believing that revealing the loss would tarnish her perceived elegance and identity. Her pride drives her to maintain the illusion of wealth, leading her and her husband to endure years of hardship to replace the necklace, ultimately resulting in a tragic irony when she discovers the original necklace was a fake.