Kit mistakenly believes that she has seen the last of William. What proof did Mercy and Judith offer about William coming around again?

When the guests leave. Judith and Mercy inform Kit that William is preparing for marriage. It is common knowledge in town that William will start building a house, once he has decided on a wife. Kit is a bit put out by this. She certainly did not know whether she wanted to marry William, and she is angry that the man has made such a one-sided decision.