Celeste and Jesse are a couple who have been best friends since high school and married young, but now, in their early thirties, they are separated and in the process of getting divorced. Despite their separation, they continue to maintain an unusually close bond, living in the same house and spending almost all of their time together. Celeste is a successful trend forecaster who prides herself on her maturity and insight, while Jesse is a laid-back artist who struggles with finding direction in life. Their friends and family are baffled by their ongoing intimacy despite the impending end of their marriage.

As Celeste pushes Jesse to move on and get serious about his responsibilities, both begin dating other people, leading to a series of realizations and emotional conflicts. They are forced to confront the ambiguities and complexities of their feelings for each other, and each must decide what they truly want from their relationship and their future. The story explores themes of love, friendship, and personal growth, examining the challenges and rewards of transitioning from a romantic partnership to a deep, platonic connection.