Kat Von D Calls Ex Jesse James a 'Cheat'

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WATCH Kat Von D and Jesse James Back Together

Kat Von D will have plenty of fodder for her new music career, which, she says, will reveal her "dark, more tragically romantic" side.

The celebrity tattooist recently branded her ex-fiance Jesse James a cheater. But don't expect to read about it in the book she's currently writing.

'No, my next book will not be about my cheating ex,' the 29-year-old wrote on her Twitter page earlier this week in response to a fan's question.

"There are way too many positive and inspiring things to write about instead," she said.

Von D's rep did not respond to ABCNews.com's request for comment.

Her tweet, however, appears to confirm rumors that James' infidelity was behind their split last week -- their second breakup since they became engaged in January. The couple broke up the first time in July.

An unidentified woman came forward last week, claiming she dated James, 42, while he and Von D were "on a break."

"Why don't you finally be a man and tell everyone why Kat dumped you this time?" the woman wrote on cheaterville.com.

"Is it because you lied to her and said that you didn't see anyone while you two were 'on a break,'" she continued. "How did she find out about me Jesse? I know you didn't tell her, and I didn't say anything because I didn't even know that you two got back together until the entire world found out."

James could not be reached for comment.

The motorcycle mogul and reality star famously cheated on his ex-wife Sandra Bullock and sought treatment for sex addiction.

Less than two months ago, James was expressing his gratitude for a second chance with Von D, whose real name is Katherine Von Drachenberg.

"Sometimes you are only given one chance in life," James told People in August. "It was up to me to open my eyes and see it. That girl is my chance. I will never stop fighting and striving to hold on to her. Showing her how special she is, and how much I love her."

James also tweeted a photo of the two of them embracing, along with the words "para siempre," or "forever" in Spanish.

Kat Von D and Jesse James.

The final episode of Von D's reality show, "L.A. Ink," which TLC canceled after four seasons, suggested that she might be moving to Texas to be near James and open a "Jesse Von Kat Tattoo and Motorcycle Emporium."

But Von D set the record straight in a Facebook post Sept. 23.

"I am not in any way moving to Texas. I am not opening up another tattoo shop. And I am not leaving my shop here in Los Angeles, High Voltage Tattoo," she wrote.

"I am not in a relationship," the skin-art expert added. "(And I apologize for all the 'back and forth' if it's caused any confusion)."

Von D also told People magazine about her breakup with James, "It was clear to me that we were just on two different paths in life."

Von D's latest path is a musical one.

"I've been passionate about music all my life," the tattooed brunette told E!'s Marc Malkin. 'I've been playing classical piano since I was 6. So I understand the form, but it will be fun to be able to translate a message."

A message possibly intended for her ex.