How does Medea convince Jason that she is apologetic?

Medea decides she must attack Jason where he is weakest. Medea changes her tone and becomes quite apologetic to Jason. She says she is sorry for her aggressive behavior and lures Jason into thinking he has won the argument. Jason makes it evident that he has been completely deceived by her,

And I myself pray that you rule your violent mind. And treat it gently:quiet calms troubles.