Should I seek a divorce from my husband who messages women and asks for their pictures, or should I forgive him for the sake of the children?

A man engaging in illicit relationships with women who are unlawful to him is an abomination and a means for the spread of corruption. If this is proven concerning the husband, then he is a wicked man. His request for their nude pictures is an audacity towards falsehood and a lack of shame. If he accepts this for his own family, then he is a dayyūth (a cuckold/pimp). What is obligatory is to advise him to repent. If he repents, then treat him well. If he persists, then seek divorce due to his transgression, for such a person cannot be trusted with the upbringing of children.