Ariadne

Ariadne was the daughter of King Minos. After helping Theseus escape from the labyrinth, she was carried to island of Naxos in her sleep, and Theseus ditched her and returned home.

When she woke up, she was heartbroken, and Venus took pity on her and decided to give her an immortal husband.

While Ariadne wallowed in self-pity, Bacchus found her, comforted her, and fell in love with her. At their marriage he gave her a golden crown, and on her death it turned into a constellation.

It must be sad for all the gods to fall in love with mortals, then watch them dying. Why don't that gods have a rule that however they sleep with gets turned into a god? Although since the gods tend to be rather promiscuous, there soon would be too many gods to fit on Olympus. Still, the couples like Cupid and Psyche are pretty lucky.