I believe that both partners are equally at fault for the collapse of their marriage. Charlie is selfish and always puts himself first. Although Charlie does not completely disregard his wife, he does not put effort into understanding Nicole’s feelings. He simply assumes that she agrees with all of his decisions. Furthermore, Charlie stubbornly insists on having his son stay in New York, where his theater company is located. He loves his son dearly and devotes a lot of time to him, yet, he does not listen to what Henry actually wants.
Nicole is the complete opposite of Charlie. She is caring yet unassertive and does not speak up. Inherently insecure, she has tied her identity to her marriage with Charlie. Because of him, she has moved to New York and started to work as an actress for his theatre company. Nicole’s lawyer (Laura Dern), helps Nicole to realize that her confidence and sense of identity is tied to her role as a wife and mother. Inevitably, all of Nicole’s pent-up anger and internalized grief unleash during the divorce process as her identity falls apart.
This stark contrast between the two personalities eventually takes its toll. Their selfishness and insecurity push them towards the desire for “victory” and make them manipulative towards their son and vindictive to one another.