The Dark Wife by Sarah Diemer

Three thousand years ago, a god told a lie. Now, only a goddess can tell the truth. Persephone has everything a daughter of Zeus could want--except for freedom. She lives on the green earth with her mother, Demeter, growing up beneath the ever-watchful eyes of the gods and goddesses on Mount Olympus. But when Persephone meets the enigmatic Hades, she experiences something new: choice. Zeus calls Hades 'lord' of the dead as a joke. In truth, Hades is the goddess of the underworld, and no friend of Zeus. She offers Persephone sanctuary in her land of the dead, so the young goddess may escape her Olympian destiny. But Persephone finds more than freedom in the underworld. She finds love, and herself.