Agatha Rio Theory

So as the spoilers say, Rio is LadyDeath and people have said that Agatha sacrificed her son for the Darkhold. I wondered why it seemed like a mutual hatred between them, because Rio asked Agatha if she remembered why Agatha hated her. And of course Rio wants Agatha dead.

My thought as to why it’s a mutual hatred between them and not one sided, is that Agatha did sacrifice her son for the Darkhold, but only because she thought Rio wouldn’t take him. She thought she could cheat death because they were in love, but when Rio had to do it regardless, they started hating each other. Imagine your partner having to take your son away from you permanently, and imagine having to take away your partner’s son after they sacrificed him.