Jeremiah Fisher's Final Love Story: Who Does He End Up With? (Book Vs. The Summer I Turned Pretty Season 3)

The question of who Jeremiah Fisher ends up with is the single most debated topic in the entire The Summer I Turned Pretty universe, and as of December 17, 2025, the definitive answer depends entirely on whether you are following the original book trilogy or the highly-anticipated Prime Video series. While the emotional core of the story centers on the love triangle between Belly Conklin and the Fisher brothers, Conrad and Jeremiah, fans of 'Team Jelly' must brace themselves for the narrative path set by author Jenny Han. The story's ultimate conclusion is a heartbreaker for Jeremiah, but the TV adaptation's Season 3 is introducing a major new character that could signal a completely different, and unexpected, final love story for the younger Fisher brother.

The first two seasons of the show, which covered the first two books, saw Belly and Jeremiah's relationship deepen significantly, culminating in them choosing each other at the end of Season 2. However, the third and final installment, based on the book We'll Always Have Summer, promises a dramatic shift that sees Jeremiah's relationship with Belly reach a painful conclusion, ultimately leaving him to find happiness elsewhere.

Jeremiah Fisher: Full Character Profile & Actor Biography

Jeremiah Fisher, often affectionately called "Jere" or "Jelly," is one half of the iconic Fisher brothers love triangle at the heart of The Summer I Turned Pretty. He is known for his sunny disposition, golden retriever energy, and fierce loyalty, especially to his family and his best friend, Belly Conklin.

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• Full Name: Jeremiah Fisher
• Nickname: Jere, Jelly
• Family: Susannah Fisher (Mother), Adam Fisher (Father), Conrad Fisher (Older Brother)
• Love Interests: Belly Conklin, Lacey, and a date at the final wedding.
• Defining Trait: The fun, emotional, and overtly expressive brother.
• Actor: Gavin Casalegno
• Gavin Casalegno's Birth Date: September 2, 1999
• Gavin Casalegno's Age (as of 2025): 26 years old
• Other Notable Roles (Gavin Casalegno): Trevor Strand in Walker and Young Sam in Noah.

Jeremiah's journey is one of profound emotional growth, moving from a carefree teenager to a young man dealing with the loss of his mother, Susannah Fisher, a complicated relationship with his brother, and the intense pressure of a highly public love triangle with Belly (played by Lola Tung) and Conrad (played by Christopher Briney).

The Definitive Book Ending: Does Jeremiah Marry Belly?

The simple and most painful answer for fans of 'Team Jelly' is no, Jeremiah does not end up marrying Belly Conklin in the original book trilogy written by Jenny Han. Their relationship, which intensifies throughout the second book, It's Not Summer Without You, and the second season of the show, reaches a dramatic peak and then a painful breaking point in the third book, We'll Always Have Summer.

The Failed Engagement and Heartbreak

The final book sees Belly and Jeremiah's relationship continue into college. The two get engaged, partially as a way for Belly to avoid choosing between the brothers and partially as a response to Jeremiah’s own emotional turmoil and a major mistake he makes.

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• The Cheating Scandal: While on a break, Jeremiah cheats on Belly.
• The Proposal: In a desperate attempt to save their relationship and avoid the inevitable breakup, Jeremiah proposes to Belly.
• The Wedding Day: Belly and Jeremiah plan to get married, but on the day of the wedding, the emotional strain and the reality of Belly's true feelings for Conrad become too much. Their wedding is called off before they make it to the altar.

Ultimately, Belly realizes that despite her deep love and connection with Jeremiah, her soulmate connection is with Conrad. The book ends with Belly and Conrad getting married several years later in a small, intimate ceremony.

Jeremiah's Post-Belly Future

While the focus of the epilogue is on Belly and Conrad's wedding, the book provides closure for Jeremiah's story. He attends the wedding with a date, signifying that he has moved on from his heartbreak. More importantly, he and Conrad have reconciled, healing the deep rift that the love triangle and Susannah’s death created in their brotherhood.

Will the TV Show Change Jeremiah's Ending? The Denise Russo Factor

The Prime Video series has already made several notable changes to the source material, and fans are desperately hoping that showrunner Jenny Han will give Jeremiah a different, happier ending in Season 3. The introduction of a specific new character—who is not in the books—has fueled these rumors and offers the most compelling evidence for a potential plot twist.

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The Introduction of Denise Russo

For Season 3, the show has cast actress Isabella Briggs in the role of Denise Russo. Denise is described as a sharp, sarcastic, and intelligent MBA graduate and a senior associate at Breaker Capital. She is a new character created specifically for the television series, and her presence is a major deviation from the original book's narrative.

• Character Name: Denise Russo, MBA
• Actress: Isabella Briggs
• Role: Senior Associate at Breaker Capital
• Significance: She is a non-book character, suggesting a new romantic path for a main character.

While Denise's primary connection in the show is reportedly with Belly’s older brother, Steven Conklin, fan speculation is rampant that she could be the new romantic interest for Jeremiah after his inevitable breakup with Belly. The show has a history of expanding the roles and storylines of secondary characters like Taylor Jewel and Steven, so giving Jeremiah a new, strong love interest—one who is not part of the high-stakes Cousins Beach drama—would be a satisfying way to provide him with a happy ending without changing the core "Belly and Conrad" endgame. This would be a major win for 'Team Jeremiah' and would allow the show to honor the book's main couple while giving its secondary lead a complete and fulfilling arc.

Topical Authority: Key Entities in Jeremiah’s Story Arc

To fully understand Jeremiah’s journey, it is essential to recognize the key entities and relationships that define his character, both in the books and the television series:

• The Fisher Family: The core unit of his life, especially his relationship with his mother, Susannah Fisher, whose death is a central plot point.
• Cousins Beach: The beloved summer location that serves as the backdrop for all his major life events and the setting for the love triangle.
• The Love Triangle: The central conflict with Isabel "Belly" Conklin and his older brother, Conrad Fisher, which creates the "Team Jelly" vs. "Team Conrad" dynamic.
• Jenny Han: The author and showrunner responsible for creating his character and determining his ultimate fate.
• The Cheating Incident: The pivotal moment that irrevocably changes his relationship with Belly and leads to the failed wedding.
• LSI Keywords: YA romance novels, coming-of-age stories, It's Not Summer Without You (Book 2), We'll Always Have Summer (Book 3).

In conclusion, while the original source material dictates that Jeremiah Fisher does not end up with Belly, instead finding closure and new love off-page, the TV series has a unique opportunity to rewrite his final chapter. The introduction of Denise Russo in Season 3 suggests that the show may give Jeremiah a more explicit and fully-developed happy ending, allowing him to move past the heartbreak of the love triangle and find a partner who is truly his own.