Orpheus's love, Eurydice dies after getting bitten by a snake. He then travels to the underworld and by his music softened the hearts of Hades and Persephone (he was the only person ever to do so), who agreed to allow Eurydice to return with him to earth on one condition: he should walk in front of her and not look back until he had reached the upper world. In his anxiety he broke his promise, and Eurydice vanished again from his sight.
when leading your love through dark passages, don't look back.