Why Does Hurston devote chapter 15 of Their Eyes Were Watching God to Janie's jealously of Nunkie?

Rather than focusing on black culture as many of the other chapters do, this chapter deals with the more universal theme of feminine jealousy. Janie's fear and anger regarding Tea Cake's possible affair are feelings that every woman past and present can relate to. Janie's loving relationship with Tea Cake is reinforced yet again by his unwillingness to look at other women.