Amber Portwood and Matt Baier are at war. Although the "Teen Mom OG" couple is reportedly still living together in Indiana, their relationship is clearly strained and on Tuesday evening, after fans were left disappointed at their failure to attend Baier's Book Signing, Portwood took to Twitter to blast her on-again, off-again fiancé.

On June 7, Radar Online shared details about Portwood and Baier's rocky relationship and revealed that Baier unexpectedly canceled a book signing set for the Barnes & Noble store in Greenwood, Indiana, just hours before promoting the event on Instagram -- and claiming Portwood would be there as well.

According to the report, Amber Portwood and Matt Baier were blasted on Twitter and Instagram after failing to attend the book signing for Baier's memoir, "You Have No F**king Idea." However, as Portwood told fans, the event had nothing to do with her. Instead, the event was solely for Baier and he reportedly used her name to make money off the event.

“I was going to support him. This is sad,” Portwood tweeted, insinuating that the Barnes & Noble description of the event, which insinuated that she would be there, was incorrect. "Don’t use my f**king name to make money and don’t do that to my fans!” she fumed.

Amber Portwood blasted Matt Baier for being stupid

Portwood told her fans on Twitter that it was she who was receiving backlash for "stupid people’s mistakes" and said she was hurt by the situation.

She even told her followers that she had cried after Twitter fans labeled her a "liar" and said she'd never do that to her fans.

Why didn't Matt Baier attend his June 6 book signing?

Although Baier told fans on Instagram on June 6 that he and Amber Portwood were looking forward to seeing their fans at the event, a source told Radar Online that Baier wasn't even in Indiana at the time the post was made.

Instead, he was in Massachusetts with his family. According to the insider, Baier is upset with Portwood for going to the "Teen Mom OG" reunion in New York City without him (she was spotted in the Big Apple over the weekend without her engagement ring).

Amber Portwood is still living with Matt Baier

The report claims that while the on-and-off couple is “still living together,” Portwood hasn't made any official decisions in regard to the future of their relationship.

To see more of Amber Portwood, Matt Baier, and their co-stars, tune into new episodes of "Teen Mom OG" season 6B on Monday nights at 9 p.m. on MTV.