Married at First Sight stars Keith Manley and Elizabeth Bice apparently don't feel like Matthew Gwynne is invested or even really interested in his wife Amber Bowles.

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During Wednesday night's episode of Married at First Sight: Unfiltered hosted by Jamie Otis, Elizabeth and Keith watched back a Season 9 clip of Matt singing Amber a song he had written for her on the guitar in celebration of their one-month anniversary.

RELATED LINK: 'MARRIED AT FIRST SIGHT' COUPLES NOW: WHAT COUPLES ARE STILL TOGETHER? WHO BROKE UP? WHERE ARE THEY NOW? (PHOTOS)

"It was horrible," Elizabeth joked of the song on Unfiltered, causing Keith to burst into laughter.

"I don't mean it was horrible in a bad way. It's just, like, he's a little tone deaf."

Jamie joked Elizabeth was acting like "the mean girl at school," so then Keith decided to stand up for Matt.

"I think it takes, I mean, truthfully, it takes balls to do that, to even be able to express yourself musically," Keith said, apparently trying to hold back his laughter while Elizabeth was cracking up in her seat.

"And it should be respected that way," he added with a big smile.

"The heart was great there, though," Elizabeth agreed. "It was cute."

After Matt performed his song at a restaurant on Married at First Sight, Amber told her husband that she'd love to marry him and have a wedding all over again, but the unenthusiastic look on Matt's face was unsettling.

"Does this relationship seem one-sided to you?" Jamie asked Elizabeth and Keith on Unfiltered.

"Yeah, that's why I started laughing so hard," Elizabeth admitted.

"I saw the same thing, so I'm just like, 'Dude, you sit here and you're not really reciprocating what she's saying back to you, and then you pull your guitar out and sing about diamonds and pearls.' It's just odd to me."
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Keith apparently noticed a disconnect between Amber's feelings and Matt's actions as well.

"It's clear to me on one side that Amber is 100 percent for Matt, and I think what it looks like right now is Matt is still trying to figure out if he's into her or not," Keith explained.

Elizabeth added that Matt's body language looked "a little cold" in that moment.

One month into the Married at First Sight process, Amber has seemingly put all of her effort into making her marriage work.

Matt, however, often disappears for hours on end and fails to communicate with his wife when he allegedly goes out with his friends.

Although Matt claims he cares about Amber a lot and wants his relationship to work, fans are questioning whether that's really the case -- just like Elizabeth and Keith did on Unfiltered.

During the latest episode of Married at First Sight's ninth season on Lifetime, Matt chose not to return home for two nights in a row, leaving Amber in hysterics.

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Amber shared with Dr. Viviana Coles that Matt acted like a completely different person when cameras were on him. She claimed that when cameras left, Matt didn't seem to want to be around her.

"If I had to make the decision right now [on whether to stay married or get divorced], it would be a big, fat 'no,'" Amber told Viviana. "I'm not getting the love I feel like I deserve."

Amber additionally told the cameras Matt was really good at telling her what she needed to hear and so she needed to see his actions change.

In addition to Elizabeth, Keith, Amber and Matt, Married at First Sight also stars Elizabeth's husband Jamie Thompson, Keith's wife Iris Caldwell, and Deonna McNeill and her husband Gregory Okotie.

RELATED LINK: 'MARRIED AT FIRST SIGHT' COUPLES NOW: WHAT COUPLES ARE STILL TOGETHER? WHO BROKE UP? WHERE ARE THEY NOW? (PHOTOS)

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