On Wednesday, Jodi Arias testified that she had threatened her ex-lover that she killed, Travis Alexander.

Arias, 32, admitted that she told him that she would tell people he was a pedophile.

"The only thing I'll be spitting out is the fact that you're a pedophile," Arias said she told the 30-year-old Mormon, according to HLNTV.

Arias said the couple's fights went from arguments to physical and she was frustrated because it was "up and down" with Alexander.

"I would feel down at times and then up. Sometimes, I would do something to piss him off and he would send more mean text messages or e-mails or chatting," Arias said.

When Alexander would get mad, Arias said she her nerves would get so bad she would "tremble."

"It was like my nerves, kind of like a Chihuahua shakes, they just kind of tremble a little bit," she said.

Arias said she tried to be cordial and to be "friends" with Alexander because they worked for the same company, and she didn't want it to be uncomfortable should they run into each other.

Alexander had told her he was dating another girl, Lisa Andrews, in the spring of 2008. Despite this, Arias continued to sleep with him, because "old habits die hard."

"I felt really bad because I knew what it was like when I found out that he was seeing a bunch of girls on the side when I was his girlfriend," she said about her victim. "And now he had a girlfriend and I was one of the girls that he was seeing on the side that his girlfriend didn't know about."

Arias said even after she moved to Yreka, their arguments "would always end up with me apologizing more and I felt bad for saying that too."

They continued to stay in touch while she lived hundreds of miles away and had phone sex. Then her testimony switched to his fits of jealousy.

Arias spoke about Ryan Burns - a man she met in the spring of 2008 and visited outside of Salt Lake City. They kissed the day after she killed Alexander. Burns testified as a prosecution witness earlier in the trial that he kissed Arias.

"It had been a pattern of Travis since before we dated, that he didn't take kindly to me going on dates with other guys...even after we broke up," she said of Alexander when he learned about Burns and another man she met, John Dixon.

Her testimony switched to sex when her defense attorney asked about sexually explicit text messages Alexander sent her.

Alexander sent Arias her a text about a sexual fantasy to see her dressed like Little Red Riding Hood. He wanted to tie her to a tree and then have sex with her. Alexander Arias said in May of 2008 she was "probably" willing to have animalistic sex with Alexander and he called her a "slut" when they had sex.

"Well, he wasn't saying it as an insult...I just knew that he was enjoying himself," said Arias. "He calls me a bitch, he tells me I'm worthless," she said.

Arias said she told Alexander again in May of 2008 he needed professional help for his attraction to children.

"I didn't really want to bring it up anymore. But, after he made that comment about sodomzing a little girl on the phone. I was concerned that he wasn't making any progress. So, I sent him another of a little stack of pamphlets that I had."

Arias stands accused of murdering Alexander in his Mesa, Ariz., home on June 4, 2008. When police found the victim, they saw that he had been shot in the face, stabbed 27 times and his throat was slit from ear to ear. Arias lied at first, and said he was killed during a home invasion and later admitted she killed Alexander as an act of self-defense.

If Arias is convicted of the murder she will likely face the death penalty, becoming the fourth woman in Arizona's history to die by lethal injection. Watch the free live stream of day 16 of Arias' murder trial in the video below beginning at 12:30 p.m. EST.

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