Ending Question

As noted in a previous thread, divorce was very difficult at the time of this movie; and in addition, Tina would probably be under the custody of her mother, something that no one, including the mother, would want, or be able to avoid. The divorce would likely have much more negative fallout then than it would now, including the reputations of Jerry, Isabelle, Beatrice (remember there's another daughter involved), and also Charlotte, since she would likely be implicated in the proceedings. None of this would help Tina. Or Cascades, for that matter, with Jaquith having known about the relationship and allowing Tina to be with Charlotte.

In these circumstances, the marriage remains. Tina will remain nominally under the guardianship of Dr. Jacquith (sp) and Cascades but actually with Charlotte. The mother (and sister) could visit whenever they wish, though I can imagine how often that would happen. Jerry can also visit whenever he wishes, but he and Charlotte can't indulge in a physical relationship. This is far from perfect, but it preserves everyone's reputations, and it allows Jerry and Charlotte to share what matters most: the wellbeing of Tina.