Amber Portwood Accuses Matt Baier of Cheating, Quickly Deletes Tweet

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Last night, Amber Portwood appeared to accuse fiance Matt Baier of cheating in a Tweet ... which she quickly deleted and replaced with a more positive message.

Amber Portwood, Matt Baier

An insider says the Teen Mom star, 24, and her beau, 43, got into a heated argument about a phone conversation he had with an ex of his months ago.

What happened and why did it rub her the wrong way to such an extent?

“Matt had a friendly conversation with the girl and snapped a platonic selfie while he and Amber were in Las Vegas last fall,” the source explained.

“Amber was really upset and said she didn’t want Matt to talk to her.”

The incident came up again in a fight yesterday, and an angry Portwood took to Twitter to vent her frustration.

“Every man I give my heart to uses me and cheats on me @mattbEPT,” she said, including her fiance’s Twitter handle before deleting the statement.

“We’re going to try to work out it,” she added (that tweet is still up).

As a result of the message, Matt Baier quickly found himself bombarded by hateful tweets and even death threats from Ambs' army of loyal followers.

That was the point, according to the source close to Portwood.

“Because she’s so powerful on social media, she did it to prove a point,” the insider says. “Now she knows he will never speak to another woman again!”

Extreme? Maybe, but he's reportedly capitulated on this one.

Baier supposedly admitted he shouldn’t have picked up his ex’s phone call, and the couple patched things up, with her message received loud and clear.

Though the source insists that Amber believes Baier did not hook up with the other woman or even flirt with her on the phone, she felt he violated her trust.

“Amber is sensitive about cheating, because of what Gary did to her,” the insider reveals, referring to her baby daddy and former fiance Gary Shirley.

As you know if you watch Teen Mom online, Gary is now having a second baby with another woman, having allegedly two-timed Amber when they were together.

Just how "together" they were is debatable, given that she spent 17 months in jail, but she clearly felt there was hope for them before, during and after.

Then he knocked up Kristina Anderson, and broke Amber's heart.

Here's hoping Baier knows what he's getting into, because her past is tumultuous and her psyche - despite all the progress she's undeniably made - fragile.

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Amber Portwood Biography

Amber and Leah (Teen Mom)
Amber Portwood is a star on MTV's Teen Mom. She is the mother of Leah Leann Shirley, whose father is Gary Shirley, Amber's on-off fiance... More »
Anderson, Indiana
Full Name
Amber Portwood