I thought she was supposed to be an expert. Even an idiot can see she is describing the type of relationship that people get into, and out of, every day. You date a person, discover that they don't have the qualities you care for, such as being flirtatious, dishonest, unfaithful, lazy, whatever. That is the point of dating, to get to know another person. Once you discover that they have traits that you don't want in a partner you move on. You can't change them and you can't accept the way they are. You find a person who does have those traits, who does make you feel special.
Apparently JA didn't get the memo that that is how it works in the adult world. You don't move to be near them, continue to use sex hoping that will make them want to change, you don't hack their email, MySpace and Facebook accounts. You don't murder them because they don't want you any more, because they found someone they like better. You move on, you don't kill.