According to the Shanti Parva of Mahabharata after the war of Mahabharata Kunti told the truth about Karna’s birth to Yudhishthira. the Pandava brothers were very sad hearing about this and blamed their mother for keeping this a secret from them. They performed the last rites of Karna.
However, because of keeping this secret Yudhishthira cursed all the women that they will be unable to keep any secret for long.
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