Why does Medea think it is necessary to kill her sons to get revenge on Jason?

kills the
children to spite Jason. The core focus of the play is on the fact that Jason is going to marry
a Greek princess, and Medea, who is a foreigner, will be relegated to mistress statusher
children by Jason would presumably also be illegitimate once the new marriage is contracted,
although this is not stated outright. Medea is furious because she helped Jason significantly
during his travails with the Golden Fleece, but Jason's only response is that he has to marry a
Greek woman, so unfortunately this cannot be Medea. She replies that shes left everythingfamily,
homeland, language, godsto be with Jason, and hes casting her aside without ceremony. Jason
effectively tells her to calm down and get over it.

In response, then, Medea
feels she can only punish Jason properly by taking everything away from him in order to impress
upon him her feeling that everything has been taken from her. She achieves
this by poisoning his new wife, murdering his children (whom he presumably was going to
disinherit in favor of his new legitimate children), and then running away to Athens to marry
the king there. She takes the childrens bodies with her so that Jason cant even hold them or
bury them, and she makes a point of saying shell bury them by Heras templeHera being the
ultimate representation of the wronged wife in Greek mythology. She didnt
want to kill the children, but she wanted to make the point that she lost
everything to be with Jason, and since he no longer cares, shell rip everything away from
him.