Because Scarlett has promised Ashley that she would take care of Melanie, her whole life is now centered around Melanie and Melanie’s pregnancy. Outwardly, Scarlett appears to be acting selflessly towards Melanie. In actuality, she is being kind to Melanie only because she loves Melanie’s husband. However, Melanie’s role in Scarlett’s life forces Scarlett to think of others besides herself, suggesting this may still be an opportunity for Scarlett to grow.