In "After Ever Happy," the fourth book in Anna Todd's 'After' series, the relationship between Tessa and Hardin continues to be tested. Despite the trials they've faced, their bond appears unbreakable, deepening with every challenge. However, when Hardin's past is exposed, and Tessa faces a personal tragedy, the strength of their relationship is questioned. This book lays bare the complexities of their characters, revealing dark secrets and intense emotions that challenge the nature of their love and their identities, forcing both Tessa and Hardin to confront who they truly are.