I strongly recommend Edward Edinger’s book The Eternal Drama: The Inner Meaning of Greek Mythology (Shambhala, 1994). It is full of thought-provoking explanations and arguments. In recounting the story of Jason and Medea, Edinger notes a recurring theme in Greek mythology: the hero defies death and achieves his quest through the help of a woman whom he promises to marry or honour in some way and whom he subsequently abandons.