Jeremiah ends up with Denise in the TV series "The Summer I Turned Pretty." After spending time living together and forming a friendship, their chemistry leads to a kiss at Jeremiah's dinner party, hinting at a potential romance. However, the fate of their relationship remains somewhat open as Denise plans to move to San Francisco with Steven and Taylor. Meanwhile, Belly ultimately chooses Conrad, and Jeremiah is left with this new romantic prospect outside the original love triangle.
In contrast, in the original book series, Jeremiah does not end up with Belly; Belly marries Conrad. Jeremiah shows immaturity and they break off their engagement, and at the wedding scene in the epilogue, Jeremiah is seen with an unnamed date.
So, specifically for the show, Jeremiah's romantic storyline concludes with him showing interest in Denise, distinct from the book's ending.