What are two stories about why theseus returned without ariadne?

However, when they landed on the island of Naxos, Theseus abandoned her as she was sleeping. It was here that the god Dionysos discovered her and made her his wife.

Some say that she was later slain by Artemis, or else granted immortality.

In another account, Ariadne's bridal with Dionysos occurred several generations before, when the god was still wandering the earth introducing his cult. But when he rode into battle against the Argives with his band of sea women, she was slain or turned to stone by King Perseus. The god then descended to the underworld through Lerna to bring her back, before ascending to Olympus.