In what ways is Godfrey a changed person?

In Chapter 15, we see that Godfrey Cass, having narrowly escaped complete disaster, seems quite firm, resolute, sober and happy. Certainly Nancy will marry him, given his about-face, and certainly all will be well, he imagines. But Godfrey has not yet sacrificed a thing. He is still his normally dishonest, cowardly soul. Circumstances have changed--his wife has died, his child is being taken care of, Dunstan has disappeared again--but nothing substantial has changed in Godfrey's character. He is still susceptible to his old weaknesses. In Part Two, Godfrey finally will have to face up to his cowardice.