Belly ends up with Conrad in Season 3 of "The Summer I Turned Pretty." In the finale, after some emotional moments and a surprise visit by Conrad in Paris, Belly confesses her love for him. They reconcile and decide to be together, symbolized by a scene where they walk hand in hand into the beach house at Cousins. This ending follows the original book series by Jenny Han, where Belly ultimately chooses Conrad after a complex love triangle involving the Fisher brothers. The series finale also shows the brothers reconciling and moving forward in their own lives, with a hopeful outlook on the future for all characters.