In the book, after the concert where Wentworth gets jealous as he watches Mr. Elliot with Anne, she has the "delightful conviction" that Wentworth still cares for her, but she can see he is labouring under a misunderstanding. Anne worries about it. Due to social conventions, she cannot just walk up to him and let him know she still loves him. "How was such jealousy to be quieted? How was the truth to reach him? How, in all the peculiar disadvantages of their respective situations, would he ever learn of her real sentiments?"
Yes, how? The only impediment to Anne's Happy Ever After is the social convention that women did not declare their affection to men. That's it. Well, better she run the risk of losing Wentworth again, than go against the social convention! Will misunderstanding keep our lovers estranged from each other?....