Yeah, there's no getting around the fact that this myth is chock full of some pretty serious betrayals. First, there's Agamemnon who betrays his daughter, Iphigenia, by offering her up as a sacrifice to Artemis so that he can go off and fight the Trojan War. Not only is this a betrayal of Iphigenia, it's also a major stab in the back to his wife, Clytemnestra. We can't think of many worse things one parent could do to another than kill a child they created together.
Clytemnestra answers Agamemnon's betrayal with some of her own. While the king is off at war, she starts sleeping with his cousin, Aegisthus. (Ouch. Also, ew.) When he gets back, she seals the deal by stabbing her hubby to death. (Ouch again!) No doubt about it, these people do some serious backstabbing. Well, in Clytemnestra's case, she does some heart-stabbing, some chest-stabbing, some face-stabbing and whatever other creative kind of stabbing you can think of.
When Clytemnestra stabs Agamemnon to death for sacrificing Iphigenia she wreaks a pretty awful revenge. What makes the myth interesting (to us anyway) is that to her, it isn't really revenge at all. To the queen, she's only giving her husband what he rightly deserves. She feels like she has every right to make Agamemnon pay for what he did. We love this myth because it really makes us think about the line between revenge and justice.