What made Matilda sad and miserable?

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Answer: Matilda Loisel became very sad when they realised that the necklace had been lost. They were sure that the loss of necklace would make their life hell because Mr Loisel was only a petty clerk and it was very difficult for him to replace necklace of diamond.
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She helped Matilda by giving her the necklace. She could never imagine that her friend would undergo such a hardship for that fake necklace. After ten years, after knowing the truth and reality she must have been upset. She would have definitely returned the necklace to Mme Forestier.
Answer: Matilda Loisel became very sad when they realised that the necklace had been lost. They were sure that the loss of necklace would make their life hell because Mr Loisel was only a petty clerk and it was very difficult for him to replace necklace of diamond.
Solution. Matilda was not satisfied with what her life had to offer and was ashamed of her status. As she was humiliated by her lower-middle-class existence, she, generally, avoided meeting her rich friends like Mme Forestier, a wealthy lady, whom she knew from her days at the convent school..
She did not have the luxuries of life like she imagined herself to be born for. She believed that she deserved better. Her friend was rich and she did not like visiting her friend because it reminded her of all the things she didn't have in life. Hence, she felt envious of them and felt humiliated in their presence.
Explanation: On the day, when Madam Forestier met Mrs Loisel, she couldn't recognise her because she had changed so badly. Mrs Loisel told the whole story and also the fact that her necklace was responsible for their miserable condition.