Ju Huishan had exposed the news of her husband contacting another woman. Did this mean that the two sides had completely fallen out?

Not necessarily. Exposing the news of the husband's contact with other women in the novel was usually a means to promote the development of the story. This did not necessarily mean that the two sides had completely shed all pretenses of cordiality, but it meant that the relationship between the two sides had been challenged. In this case, the next development of the plot might depend on the reaction and handling of both parties.