Obsession (2019) Plot Summary & Ending Explained

In the final moments of "Obsession," Anna and William’s troubled relationship reaches its tragic conclusion. After Jay’s shocking death—when he uncovers William and Anna in a compromising state and falls backward down the stairs—Anna is devastated and decides to leave England to escape the chaos. William, however, remains fixated on her, seeking her out even after her departure, which highlights his obsessive nature. Despite Ingrid’s confrontation and the end of their marriage, William tracks down Anna at a secluded resort in Europe, determined to rekindle their forbidden connection. Anna, emotionally exhausted and aware of the destructive pattern, refuses to return, insisting that their affair was only sustainable with her being married to Jay. They part ways, and William, clinging to their memories, buys the flat where they used to meet, keeping Anna’s diary as a keepsake of their intense and destructive affair. The story closes with Anna attending therapy, where her therapist suggests establishing rules to her encounters—an idea that seems to excite her, revealing her ongoing obsession. The final scene hints that Anna might seek a new, similarly obsessive relationship, mirroring her past with her brother and her tragic entanglements. Overall, the ending underscores how obsession and unresolved trauma continue to shape her life, leaving her stuck in a cycle of destructive relationships.