Jordan Rodgers' ex-girlfriend Brittany Farrar is firing back at The Bachelorette suitor and accusing him of lying for the comments he made to Reality TV World about her previous "really harsh and very untrue allegations" about him.

When The Bachelorette's twelfth season premiered in May, Rodgers said his last serious relationship didn't work out because he was too focused on playing pro football. He later promised the show's star JoJo Fletcher that cheating never played a role in the split.

But Farrar took to Instagram to throw Rodgers under the bus. She wrote at the time, "Riding the bench doesn't get in the way of a relationship, but cheating does. #yourpitchisntperfect @jrodgers11 #alwayswantedtobefamous #dreamscometrue #tuneinnextweekformoreBS."

And then in an early August interview after the season finale aired, Reality TV World asked Rodgers -- with his fiancee listening -- whether Farrar was telling the truth when she had accused him of being unfaithful to her during their relationship. And again, he denied it.

"There's been a lot of really harsh and very untrue allegations along the way," Rodgers told Reality TV World.

"So, no more do I focus on one than the other. It's about moving forward. And any of that is so not true that it's not even worth time to do that. I'm just happy to start this new life with my fiancee, and that's what I'm focusing on."

Now, in a lengthy open letter, Farrar is addressing the whole ordeal and insisting SHE is the one telling the truth.

"After our breakup, I was surprised to find out what a prolific liar and cheater #JordanRodgers was during our entire 3 1/2 year-relationship. But what has surprised me even more is how he has carelessly bashed and lied about me in public. I guess he thought I wouldn't stand up for myself. #HeWasWrong," Farrar captioned her Thursday Instagram post.

Below is the message Farrar squeezed into the Instagram image:

"When I broke up with my ex and gave back his old mattress and chia seeds - that was his ultimatum to me ('Give me another chance or I want my mattress and the chia I bought back!' - his lies stopped being my problem. UNTIL he went onto one of the most popular reality shows on TV and lied about our relationship. That's when I wrote my first post about him. I was hoping that would be the first and last, but then the show ends (Hey, you're finally a winner!) and he starts calling me a liar.

With the power of a press tour, his lies reached our hometown and my family and friends are now constantly approached by mutual acquaintances. After weeks of this, I started wondering why I feel like I'm the one who should be silent when he was the one who jumped on a reality show hoping to catch fame as a last ditch attempt to make something of himself.

His choice has become other people's consequences. So if I don't have a choice in whether people back home are talking about me, then I might as well have my voice in this.

Unlike Jordan, I'm not going to sell stories to magazines. Instead I'm posting right here. Because to me truth is not about fame - I don't want it. And it's not about money - I can afford to leave some chia behind. All I want is the same thing that anyone else who's been wronged would want: the chance to share the truth.

Since the show ended, Jordan has been busy trying to push out new headlines casting himself in the role of the victim. In every interview, he's talked about cheating rumors being 'really harsh and very untrue' and how 'hurtful' it's been to talk about his family drama, completely ignoring the fact that the world was oblivious to these issues until he put it out there.

You're wondering why there isn't a flood of positivity around your engagement? Maybe it's because your recent fame is built on you tearing down people and rewriting the truth to fit your storyline.

So here's some of the proof I have that Jordan left out. Probably because it doesn't fit into the new character he's created.

This is going to be a two-part post. I'm laying it all out there because I don't want to do this again. Unlike Jordan, I'm not desperate to stay in the spotlight."