He betrays her.
Medea
The name Medea came from the mythology princess Medea and her husband Jason
Jason married Medea in Greek mythology. However, while married to her, he engaged himself to another princess. Medea killed her, and rode away on a chariot pulled by dragons.
in greek mythology, Medea was a sorceress who left her kingdom with a hero named Jason and her little brother. she had managed to help Jason in a situation and they left the kingdom, Jason promisded to marry Medea. However, medea's father was going after them and they had no time so medea killed her little brother and chopped him to pieces to get them sometime and threw the remians into the ocean. Jason was shocked by this event and he left her.
Medea is a figure in Greek mythology. She is the daughter of King Aeëtes of Colchis and granddaughter to the sun god Helios. She marries the Greek hero Jason.
Possibly you are asking about Jason and Medea.
Jason and the golden flecce
Medea
Medea was a character in Greek mythology, known for being a sorceress and the wife of Jason, the hero of the Argonauts. She helped Jason in his quest for the Golden Fleece, but later betrayed him due to his infidelity.
Jason and Medea and the Argonauts stole the Golden Fleece.
After Medea killed the princess that was married to Jason, she was married with Jason. One day, Medea and Jason were at the beach and a ship timber fell on Medea's head. Then Medea died.
By some accounts, yes - in others Medea merely killed her children by him.