Below are some observations of Jodi by Travis' good friends, Chris and Sky Hughes:
For months they communicated through phone calls, email and text messages, and met for
romantic rendezvous at Chris and Sky Hughes’ house, a midway point in their long-distance relationship.
She was very good at manipulating people… She was like a chameleon,” says Chris Hughes.
http://www.timespublications.com/aug10-feature1.asp
"[Arias] was totally obsessed with him," (Sky) Hughes said. "She wouldn't let him go. Whenever he would try to sever all ties, she would threaten to kill herself ... He would tell her he didn't want anything to do with her, and she would show up at his house. We knew it was her. We didn't want it to be her, but [we] just knew it was."
She would break into his email -- multiple times -- [and] when he began dating another girl, she snuck into the house and watched them sleeping -- they had fallen asleep on an oversized bean bag watching a movie," Hughes said.
"He would be at his girlfriend's house and someone would knock and run -- he knew it was her. His tires were slashed twice and he 'knew' it was her. His girlfriend's tires were slashed, and again he knew it was her ... If Travis began talking to a girl or took a girl on a date, it was shortly after that Jodi would friend them on MySpace and began talking to them."
Hughes added: "To say Jodi was creepy and obsessed with Travis would be a huge understatement."
http://www.huffingtonpost.com/2011/12/29/jodi-arias_n_1174274.html#s579311&title=Jodi_Arias
Somewhere I saw an interview with the Hughes and they spoke about the late night discussion they had at their house with Travis about how worried they were about him dating Jodi (Jodi had gone to bed quite a bit earlier). At some point, the wife says out loud that she bets Jodi is eavesdropping and sure enough, here Jodi comes into the room, pissed off at what she heard.
Sky Hughes said Jodi gave them a look that scared the poop out of them. After that, they told Travis that Jodi wasn't welcome at their home or around their children anymore.