Love is a luxury when survival is at stake, and nowhere is that more true than in The Hunger Games. Starting as two tributes from District 12, Peeta Mellark and Katniss Everdeen's relationship went through a complicated and substantial evolution throughout the franchise. It's one of the strongest plot threads of the saga, since author Suzanne Collins paints their romance in natural and organic terms, aptly matched by the quartet of Hunger Games film adaptations.
Source:https://www.cbr.com/hunger-games-when-katniss-love-peeta/