Is it considered a sin to inform a wife that her husband has married another woman if this leads to her seeking a divorce?

Informing a wife that her husband has married another woman is not a sin if the informant is truthful and does not intend harm, even if the wife seeks a divorce because of it. However, the informant sins if they intend corruption, or if they disclose a secret entrusted to them. Similarly, it is forbidden to disclose a secret if one is commanded to conceal it, or if there is an indication to that effect, or if it is something that is customarily kept secret.