What songs are sung by the ensemble in Act 2, Scene 9? What are the songs about?

Diana and Natalie ask Dan and Henry why they stay in "Why Stay", a song which ends with both women saying both the men and the women might be better off separate. Dan and Henry profess that they made a promise ("A Promise," lightly rocking but urgent and insistent), Dan saying he'll re-make his promise to be with Diana forever.