Excellent discussion and great ideas. A few comments--
Arias did not break up with all her previous boyfriends on her terms. Except for Daryll Brewer, she testified that they all found other women, which she learned about by stalking/spying and refining her sleuthing techniques over time. She discovered Bobby Juarez emailing another woman by hitting the back button on the library computer he had been using. She claimed a stranger walked into her workplace and told her Matt was seeing Bianca (clearly a lie since she used it more than once). Keep in mind that the one brave roommate who surfaced said there was a parade of men going to Arias' room, so she was kicked out. When she says she is a "one man at a time" woman, she means she doesn't do threesomes.
Breaking up with someone and stalking them does not make sense. Stalkers are those who have been dumped against their will-- or who feel a sense of ownership or possession without any participation of their target at all. The stalker can see it as a game of him/her wits against the wits of the target. A way to prove they are winners and not losers, even though rejected.
I completely second what you said about Jodi Arias being always evil. People who wail about what could have been done at this point or that point are well-meaning but don't realize that "bad to the bone" is real. Some people are just born that way and nothing can be done. They are anomalies, sports, and we are fascinated with them in that same gawker way we tend to stare at someone with a physical birth deformity.
But with fear.