Kate Major to Jon Gosselin: Man Up, You Liar!

Never underestimate Jon Gosselin's impact on a woman.

Hours after Kate Gosselin's revealing Today show interview, Kate Major, also known as Kate 2.0, sat down with E! News to talk about - and call out - her ex-flame.

Specifically, she calls Jon a "liar" and "two-timer."

"We had plans to travel together, to live together and to be together," Kate Major says. "He made his decision in the Hamptons. He wanted to be with me."

Oh, Kate 2.0. So sweet and innocent. Don't you know a guy will say anything if there's a good chance he can get in your pants in the next 20 minutes?

Ed Swiderski definitely knows that.

Just last week, Jon Gosselin reportedly claimed his relationship with Major was strictly platonic. But according to Kate 2.0, Jon told her he was planning to break up with his girlfriend Hailey Glassman in order to be with her instead.

As a result, Major resigned from her job as a Star magazine reporter to avoid a "conflict of interest." Then he said he was always with Hailey. Stings hard.

"He told me he was going to Massachusetts to break up with her," says Kate Major. "I know the truth. He knows the truth. Unfortunately, she did not."

Jon Gosselin and Hailey Glassman say they never broke up, which Major says is a lie: "He tried to two-time both of us. He wasn't honest with Hailey. He needs to man up and tell the truth. I'm not going to be the other woman."

Clearly miffed, Kate Major claims she has "proof" they were hitting it.

"I was not the only one who was around when we were romantically involved," says Major. "We were holed up. It's not like we were just sitting there."

Major says Jon was even the one who asked her to quit her job.

"I was with the person I was reporting on... It was a huge conflict of interest," Major lamented. "He's the one who actually told me to quit my job."

Major also laments that the fallout "has been a nightmare. I did not want to have to do this. I have to speak. I did not want to have to sell him out but when he makes me look like a liar, a fool and an idiot. I have to cash in speak out."

"In no way did he tell me he was going to be with me one minute and then go parade with his ex-girlfriend the next. This whole experience has taught me so much. When I had Jon's support, it was hard. Now that I don't, it's even harder."

Kate Major can't believe Jon chose this over her. We sort of sympathize.