Jason is treated as a hero since he retrieves the golden fleece, and Medea gets no recognition for it.
She betrays her entire family and even kills her own brother, but she did not care because she was in love with Jason. He leaves her for another woman, and now she has absolutely nothing. Medea cannot escape her past, her actions become her personality that because of the influence of the gods and setting of the
plot.
Everything cannot be entirely condemned for what she has done. If the gods did not intervene there probably would not have been any problem. The gods only did one thing that made everything go downhill, Cupid shoots one of his infamous arrow at Medea which makes her fall in love with Jason. Though the gods do control mortals lives they abuse their power sometimes. In the myth, the nurse talks to the tutor about Medea and clarifies about the amount of power the gods have."And when the gods get angry with some home, the more wealth it has, the more it is destroyed" (Euripides 154-5). Since the gods have authority over the mortal, they appeal to exploit their powers. It like they are watching a movie and they did not like the way the movie was going, so they alter it. The gods have a great amount of power it should not just benefit the gods.
An oath should be taken very seriously if an oath is broken not only will it make someone cynical, but also make them look like a coward. This is comparable to Jason and Medea's situation because Jason broke an oath that he made with Medea which was that he was never going to leave her. After all, she has done for him, betraying her family and killing her own brother Jason had just one thing to do, keep his oath and he could not do it. In the myth, the nurse talks about how Medea was mourning over what Jason had done to her. "As for Medea, that poor lady, in her disgrace, cries out, repeating his oaths, recalling the great trust in that right hand with which he pledged his love. She keeps calling to the gods to witness how Jason is repaying her favors" (Euripides 26-31).Jason leaves Medea with absolutely nothing, leaves Medea due to his obsession with kingship, and marries a different woman. She loses her mind which was understandable and seeks revenge on her former husband, if only he kept his oath.
Medea cannot escape her past, her actions become her personality. Every action she did when Jason was in search of the golden fleece was deceiving and brutal to her family. She had no problem killing her own brother, and now she has no problem killing her own children. When she was killing her brother it was because she was in love with Jason and now she kills her children to crush him. She wants him to know how she felt when he left her. There is no way she was going to escape her past, and now her actions of being cold-blooded are now her personality. Medea would not have been like this if the gods didn't intervene and Jason kept his oath.