Natural Setting in "Philaster"

Early in scene II, Philaster's monologue equates nature with virtue and society with corruption: "that I had been nourish'd in these woods / ... and not known / the right of crowns nor the dissembling trains of women's looks; ... then had taken me some mountain-girl, ... , chaste as the harden'd rocks." With the idea of nature = virtue/chastity, society = corruption in mind, how does the forest setting of Act IV, scenes II, III and IV function?