What is the story between Medusa and Athena?

Back then, Medusa was Meda and she wasn't evil then. Poseidon and Athena were married, but Poseidon kind of liked meda, so they had sex in the temple of Athena. Athena spotted them and got jealous so cursed Meda and made her ugly with snakes as hair and stone eyes so no one could look at Meda. After that Meda changed her name to Medusa, a snake's name. And she turned evil because she was hurt that no one once liked her anymore. Then Phereus used his shields to look her in the eye, cut her head off, and put it in a bag. I fell kind of sorry for her. I don't they she new she was gonna get raped by Poseidon and she got ugly and i would have my feelings hurt to. AND THAT IS THE STORY!