The Bachelor Presents: Listen to Your Heart participant Natascha Bessez is dishing on why she threw Trevor Holmes under the bus on the show, calling him a "serial cheater" and "pathological liar."

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"Coming on and knowing the guy is a serial cheater and a serial liar -- a pathological liar -- it just upsets me, like, it does something under my skin. I'm like, 'No, this just doesn't sit well with me,'" Natascha told Us Weekly in an interview.

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On Monday's episode of The Bachelor Presents: Listen to Your Heart, Natascha entered the mansion after the first Rose Ceremony looking for true love, and she told Us she "had no clue" Trevor was also on the show -- and she simply wasn't okay it considering he had crushed his ex-girlfriend and Natascha's close friend, Sierra Nielsen.

"As soon as I hear, 'Yeah, there's this guy, Trevor,' I was like, 'Why does that ring a bell?' And I started asking questions. I was like, 'It isn't. It couldn't be. It must not be.' I was like, 'The guy from American Idol?' And they were like, 'How did you know?' And I'm like, 'He dated a girlfriend of mine.' It's just crazy to me he would sign up for this," Natascha said.

Natascha explained she and Trevor had never met before but once chatted through text about possibly filming a cover video together, which never came to fruition. Natascha, however, said she had seen photos of Trevor given he had dated Sierra for two-and-a-half years.

Claiming Trevor had cheated on and lied to Sierra during their serious relationship, Natascha set out to warn Trevor's new love interest, Jamie Gabrielle, about his past and alleged player ways.

"I think when you really care about women that have been betrayed and hurt in the past, it kind of strikes a chord with you, because I feel like it's happened to all of us," the 33-year-old pop singer from New York told the magazine.

"I feel like you wouldn't want that to happen to your sister or your best friend. It's just, like, if you see a burglary happening, you call 911. It's like one of those things."

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Not only was Jamie warned about Trevor's alleged wrongdoing, but Natascha also confronted Trevor face-to-face about his indiscretions. Natascha told Trevor, 29, she had been told he lied to and cheated on his ex, but Trevor insisted Natascha only heard one side of the story.

Trevor claimed he had "emotionally cheated" but never physically stepped out on his former girlfriend; however, he did admit to lying.

"I was defending my girlfriend. I care for her deeply, and she is just a strong, smart woman and it's just crazy to me how women that are together with it and are aware of things can be so easily manipulated by someone who is just like a pro at it," Natascha explained.
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"This guy is a pro at it, and it's just crazy to me how he can come on a show like this, being, like, 'I'm looking for the love of my life and to settle down,' when it's like, 'Dude, you've been doing this consistently.'"

When Trevor first talked to Jamie about his most recent ex-girlfriend, he owned up to making mistakes and not being perfect. Trevor also said he stayed in the relationship longer than he should have and so the girl ended up getting hurt, but he left out any mention of cheating since Jamie had been cheated on multiple times in the past and never wanted to be in that situation again.

Trevor, however, felt forced to come clean about all the details to Jamie after Natascha demanded he be honest with women he's dating.

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"Here I am really thinking that this was just a one-time deal with my girlfriend this had happened and I'm like, 'You are not going to get away with coming on a show with a bunch of women who are literally open-hearted, ready to meet someone,'" Natascha said.

She added, "I feel like the women here that are maybe falling for this need to be aware. They need to just have the information and then, with that information, do what they want with it. As long as they know the truth, [I'm good]."

Once Jamie heard the truth, she decided to stay with Trevor anyway in the hope he was a changed man. Jamie didn't want to deny herself the connection and chemistry she felt with Trevor, especially after enjoying a romantic date together.

"Imagine if we had we had gone to, like, the end of their relationship and then she would have found out and she's like, 'Tasha you knew and you didn't say anything?' That would have been way worse. That's just not something I would do. That she knew was my priority," Natascha explained.

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As far as Jamie and Natascha being friends on The Bachelor Presents: Listen to Your Heart, Natascha said, "It's an interesting dynamic... Every episode, things change. Things get crazy. Things get different and put into perspective."

The Bachelor Presents: Listen to Your Heart currently airs Monday nights at 8PM ET/PT on ABC.

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