The Shocking Truth: Did Jeremiah Cheat On Belly In The Summer I Turned Pretty Season 3?

The question of whether Jeremiah Fisher cheated on Belly Conklin has been the single most explosive point of debate among fans of The Summer I Turned Pretty (TSITP) since the series was announced. As of today, December 18, 2025, the dramatic tension surrounding the Belly-Jeremiah-Conrad love triangle is at an all-time high, especially with the highly anticipated third season, which is based on the final book, "We'll Always Have Summer," set to adapt this controversial storyline. The short answer, according to the source material, is yes—a moment of profound betrayal occurs, though the specifics of the 'cheating' label are complex and hotly debated.

This storyline is the pivotal moment that shatters the seemingly perfect relationship between Belly and Jeremiah, fundamentally altering the course of the entire series and paving the way for the ultimate endgame. Fans are desperate to know if the show will follow the book’s path, which features a devastating incident at a frat party that Belly discovers, leading to a painful confrontation and the eventual rekindling of the 'Bonrad' relationship.

The Central Players: Belly, Jeremiah, and the Fisher Family

The entire emotional weight of the cheating controversy rests on the shoulders of the two main actors and their complex characters. Understanding the profiles of the stars helps contextualize the immense pressure they face in portraying this fan-dividing plot point.

• The Surprise Vegas Wedding And Shared Grief 5 Shocking Details Of John Schneider And Dee Dee Sorvinos Whirlwind Romance Ohirf

Lola Tung (Isabel “Belly” Conklin) Profile

• Full Name: Lola Marie Tung
• Date of Birth: October 28, 2002
• Place of Birth: New York City, New York, USA
• Notable Role: Isabel "Belly" Conklin in The Summer I Turned Pretty (TSITP)
• Education: Graduated from Fiorello H. LaGuardia High School of Music & Art and Performing Arts in 2020.
• Career Start: Her role as Belly was her breakout role, bringing her global attention.

Gavin Casalegno (Jeremiah Fisher) Profile

• Full Name: Gavin Perry Casalegno
• Date of Birth: September 2, 1999
• Place of Birth: Dallas, Texas, USA
• Notable Role: Jeremiah Fisher in The Summer I Turned Pretty (TSITP)
• Family: He is the eldest of three children, with one younger brother and a younger sister.
• Ethnicity: Caucasian

The chemistry between Lola Tung and Gavin Casalegno has made the 'Jelly' relationship a fan favorite, which is why the prospect of Jeremiah’s betrayal is so painful for many viewers. This emotional investment is what makes the third season's plot so crucial to the series' legacy.

The Definitive Answer: Did Jeremiah Cheat on Belly in the Books?

To understand the most current information regarding the show, we must first look at the source material: Jenny Han’s third novel, We’ll Always Have Summer. This is where the infamous incident of betrayal occurs, which serves as the catalyst for Belly and Jeremiah’s engagement and subsequent breakup.

The short answer is: Yes, Jeremiah had a sexual encounter with another girl while he was in a relationship with Belly.

• The Facts Of Life Cast Where Are Eastlands Girls Now 2024 Updates 2tx8p

The context, however, is what fuels the never-ending debate:

• The Incident: The betrayal happens when Belly and Jeremiah are at a college frat party. Belly discovers that Jeremiah has been intimate with another girl.
• Belly’s Reaction: Heartbroken and furious, Belly slaps Jeremiah and retreats, spending days in bed devastated by the news.
• The Debate over "Cheating": Some fans argue that Belly and Jeremiah were on a 'break' or had broken up shortly before the incident, making it technically *not* cheating. However, the betrayal is deeply felt by Belly, who views it as a profound violation of their commitment.
• Author’s Stance: Even author Jenny Han has weighed in on the controversy, stating that whether Jeremiah "technically" cheated is "debatable." This ambiguity leaves room for the show to interpret the event, but the emotional impact—the sense of betrayal—remains central.

This act of infidelity, or profound disrespect, is the reason Belly ultimately realizes she cannot marry Jeremiah, despite their hasty engagement. It is the final nail in the coffin for the 'Jelly' ship, pushing her back toward her first love, Conrad Fisher.

TSITP Season 3 Spoilers: How the Show Handles the Betrayal

The most pressing question for the fandom is whether the Amazon Prime Video series will deviate from the book, especially since the show has already made several changes to the original story. Based on the latest leaks and recaps circulating on fan forums and entertainment news sites, it appears the show will embrace the cheating plot line, perhaps even intensifying the drama.

• The Enduring Legacy Of Haylor 5 Shocking Facts About Harry Styles And Taylor Swifts Relationship 10 Years Later Sf662

• The Revelation: Spoilers and early recaps for the third season suggest that the revelation of Jeremiah’s betrayal serves as a major bombshell in the season's premiere episodes.
• Conrad’s Role: In the book, Conrad Fisher is a key figure in the aftermath. Season 3 spoilers indicate that Conrad learns of Jeremiah’s actions and attempts to use the information to beg Belly to leave his brother and be with him instead. This heightens the emotional stakes of the love triangle.
• The Engagement Twist: The third season is expected to feature the characters getting engaged and planning a wedding, just like in the book. The cheating revelation is the secret that threatens to tear apart the wedding before it even happens, leading to a dramatic conclusion where secrets are revealed and tears are shed.
• Character Consistency: Some fans argue that the cheating storyline doesn’t align with the kind, loyal character Jeremiah has been portrayed as in the first two seasons of the show. However, the narrative purpose of this betrayal is to highlight Jeremiah's immaturity under pressure and to push Belly toward Conrad, who is positioned as the more stable, true love interest.

The show's decision to keep this pivotal, yet controversial, plot point is a strong indicator that the series intends to follow the book's ultimate endgame: Belly and Conrad (Bonrad) ending up together. The betrayal is a necessary narrative device to justify Belly’s shift in affection and the final resolution of the complicated love triangle.

The Final Verdict: Betrayal and the Love Triangle's End

The storyline featuring Jeremiah’s infidelity is not just a cheap plot device; it is a critical piece of the emotional puzzle that Jenny Han created. It forces Belly to confront the reality of her relationship with Jeremiah, especially outside the protective bubble of Cousins Beach.

While the debate over "technical cheating" will likely rage on among the 'Jelly' fans, the emotional truth remains: Jeremiah committed an act of betrayal that fundamentally broke Belly’s trust. This event, which is all but confirmed to be a major plot point in TSITP Season 3, serves as the definitive turning point in the series, ensuring that the love triangle reaches its dramatic, heartbreaking, and ultimately conclusive end.

The drama of the third season will not be about *if* the betrayal happened, but rather *how* Belly, Jeremiah, and Conrad navigate the fallout, leading to the long-awaited resolution that will determine Belly’s final choice.