"My Ex and Whys" follows the story of Cali (Liza Soberano) is a blogger who owns the up-and-coming blog "The Bakit List." She dreams of becoming a social media influencer. That's why when an exchange with equally "mahugot" user @DahilListBoy goes viral, she seizes the opportunity of a lifetime, even if that includes meeting the person behind the mystery account. It turns out this boy is her ex Gio (Enrique Gil), who wants to get her back. Cali is determined to not let him win, so although an irresistible deal forces them to work together, she convinces herself to not trust Gio again. But how can she keep her walls up? How will she keep herself together when she starts asking her most important why: Why do you still love someone who've caused you pain?