Is it permissible to marry a married man who refuses to inform his first wife of his desire to marry another, and is this considered an injustice to his wife and children or a cause for the ruin of his home?

We have previously clarified that there is no harm for a woman to accept marriage to a married man if she is pleased with his religion and character. The husband is not obligated to inform his wife of his marriage to another woman, but he must deal justly between his wives. If the man is religious and of good character, there is no impediment to accepting him, and your marriage to him does not oppress his wife. However, your guardian's consent is necessary.