The Summer I Turned Pretty Season 3 Episode 10: A Face-to-Face Betrayal Ignites Heartbreak as Jeremiah and Conrad Clash, Leaving Belly Frozen in the Fallout

The Summer I Turned Pretty Season 3, Episode 10, titled “Last Year,” aired on September 10, 2025, and delivers a gut-punch of raw emotion, transforming the sun-drenched nostalgia of Cousins Beach into a battleground of betrayal. The long-festering rivalry between brothers Jeremiah and Conrad Fisher explodes in a devastating face-to-face confrontation, with Belly Conklin caught in the emotional wreckage. This pivotal episode, steeped in heartbreak and revelation, sets the stage for an unmissable finale in Episode 11, where the consequences of this clash promise to reshape the trio’s futures.

Based on Jenny Han’s bestselling trilogy, the Prime Video series has masterfully built tension around the love triangle between Belly (Lola Tung), Conrad (Christopher Briney), and Jeremiah (Gavin Casalegno). Season 3, the final chapter, follows Belly’s escape to Paris after halting her wedding to Jeremiah, a decision that fractured the Fisher family. Episode 10 spans from a lonely Thanksgiving to a pivotal summer, weaving Belly’s Parisian reinvention with the brothers’ unraveling lives back home. The episode’s tight pacing and emotional depth make the climactic showdown feel both inevitable and shattering.

The episode opens with Belly navigating her new life in Paris, three months after her dramatic exit. Juggling online classes at Finch University and two jobs—barista and waitress—she lives in a cramped apartment with distant French roommates. Her homesickness is palpable as she scrolls through photos of Cousins Beach. A FaceTime call with Taylor (Rain Spencer) reveals Jeremiah’s downward spiral: he’s been crashing on Steven’s (Sean Kaufman) couch, lying about living in a frat house, and hooking up aimlessly to numb his pain. Taylor’s Friendsgiving, attended by Steven and a disheveled Jeremiah, underscores the distance between Belly’s past and present.

Jeremiah’s arc is a study in heartbreak. Having dropped out of college and rejected a job at his father Adam’s (Tom Everett Scott) firm, Breaker, he’s adrift. During a tense Thanksgiving dinner, Adam uncovers Jeremiah’s lies and cuts him off financially, demanding he “grow up.” Steven and Taylor echo this, pushing him toward responsibility. Denise (Isabella Briggs Watson), Steven’s colleague, offers Jeremiah a temporary place to stay, and in a raw moment, he confesses that losing Belly hurt more than his mother Susannah’s death. This vulnerability highlights Jeremiah’s unraveling, setting the stage for his explosive reckoning with Conrad.

Conrad, meanwhile, is the quieter storm. Ignoring Jeremiah’s silence on his Thanksgiving texts, he reaches out to Laurel (Jackie Chung), Belly’s mother, for permission to visit the beach house at Christmas. Her encouragement—“Take the risk”—prompts Conrad to send Belly a heartfelt letter, imagining her Parisian life and wishing her well. Back in Cousins, Steven reassures Conrad that not everyone holds grudges, though Jeremiah’s bitterness looms large. Conrad’s introspection and persistence paint him as the romantic anchor, contrasting Jeremiah’s chaos.

Belly’s Parisian journey deepens the stakes. On Christmas Eve, alone at the bar, she texts Jeremiah “Merry Christmas,” their first contact since the wedding, but gets no reply. Benito (Fernando Cattori Walker), the charming local from Episode 9, invites her for drinks, sparking a flirty night of darts and Vespa rides. When Taylor visits for New Year’s Eve, Belly receives Conrad’s care package: Sour Patch Kids, a Junior Mint plushie with the infinity necklace, and another letter. Shaken but resolute, Belly kisses Benito at midnight, embracing her new life. By spring, she’s dating Benito, sporting a chic haircut, and enrolling in a psychology program at the Sorbonne, extending her stay. A flashback to Susannah (Kyra Sedgwick) urging her to “see the world” reinforces her growth, though she forgets the anniversary of Susannah’s death.

The episode’s heart is the devastating confrontation at Susannah’s grave on the fifth anniversary of her passing. Conrad and Jeremiah meet by chance, their shared grief igniting a brutal exchange. Jeremiah unleashes his heartbreak, revealing he cheated on Belly in Cabo after learning of her and Conrad’s intimate Christmas moment the previous year. “You always had to win,” he accuses, laying bare years of rivalry. Conrad fires back, admitting he sabotaged Jeremiah’s wedding to protect him, fulfilling Susannah’s dying wish. The brothers trade barbs over their failures—Conrad to shield Jeremiah, Jeremiah to preserve their bond. In a wrenching turn, Jeremiah acknowledges Belly and Conrad’s deeper connection, saying, “I could never compete with what you had.” He gives Conrad his blessing to pursue her, urging, “Don’t waste it,” before they embrace, tears streaming. This cathartic clash, with Belly frozen in the fallout through their shared history, resolves the “brother war” with raw honesty.

Belly, though absent from the showdown, remains central. Her Parisian life—new romance, new apartment—shows her moving forward, yet she keeps Conrad’s letters. In the episode’s close, she writes back, thanking him and sharing her new address, signing off with “I hope you’re well.” Unbeknownst to her, Conrad, fresh from reconciliation, reroutes a work trip to Paris for $473, spurred by colleague Agnes’s teasing and Laurel’s voiceover: “Go after what you want.” The stage is set for a dramatic reunion.

Supporting arcs add depth: Steven quits Breaker after Adam discovers his startup with Denise, asserting independence. Taylor’s Paris visit brings levity but hints at her own evolving story. X posts erupted post-airing, with @floralslola sharing behind-the-scenes shots of Tung, Spencer, and Cattori, and @EW’s recap fueling Team Conrad vs. Team Jeremiah debates.

Episode 10’s betrayal-fueled clash leaves viewers reeling, perfectly priming Episode 11. Will Conrad’s surprise visit upend Belly’s romance with Benito, who playfully vows not to propose on a family trip to Mexico? Will Belly’s letter signal openness to rekindling old sparks? With the brothers’ rift mended, the finale promises emotional stakes as high as Cousins’ tides, where love and second chances collide.