Some of the alums accused Matt of being dishonest when he and Amber reunited two months after "Decision Day" during Lifetime's September 19 broadcast of Married at First Sight: Couples Couch, which features former MAFS couples offering commentary on encore broadcasts of the show's ninth season.
The reunion special -- which filmed two months after "Decision Day," when Amber and Matt opted to get a divorce, and aired on Wednesday -- was hosted by Kevin Frazier, who asked Matt flat out if he ever had sex with another woman while married.
"Thank you! Ask him out right!" Kristine yelled.
"Just own it boy," Amber told Matt at the reunion.
"Yeah boy," Bobby noted, watching it back.
"Why is he such an assh-le to her?" Danielle questioned. "I don't understand."
"He's like, 'No! I'm so done,'" Anthony laughed.
Matt squirmed in his seat and adjusted his jacket before answering, "No," to Kevin's question.
"I don't believe him," Jamie noted.
"That was a lie," Ashley said.
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"That makes me feel bad [for] Amber!" Jamie expressed.
Ashley then asked her husband, "Do you believe him?" Anthony, however, declined to answer.
Meanwhile, Matt was looking at Kevin and apologizing for disrespecting Amber throughout their relationship, but Amber demanded Matt look her in the eyes and say it.
"Just say it again," Kristine asked.
"Good for her," Danielle said, applauding Amber's strength and courage.
"Tell her!" Anthony yelled.
Matt then apologized to Amber's face for hurting and disrespecting her, but his delivery was a little cold.
Matt led Amber and many Married at First Sight fans to believe he had cheated on his wife because he often disappeared for hours on end, claiming he was hanging out with friends.
One night, however, Matt didn't return to his apartment with Amber for 24 hours and left his wedding ring in the nightstand next to their bed.
Amber also heard from her best friend Raven that Matt had been spotted out at a bar with another woman. Not only did Raven say Matt had been very focused on this woman, but Matt also allegedly left the bar with her.
In addition, Amber revealed a fellow teacher friend at her school claimed Matt had been texting another woman, whom he had allegedly asked out on a date.
On "Decision Day," Matt and Amber mutually agreed to get a divorce, leaving Amber feeling like she wasn't enough. Amber was tired of Matt's actions not matching up with his words.
Amber desperately wanted her marriage to work and had genuine feelings for Matt, but she wished the former pro basketball player had just walked away from their marriage earlier since he clearly wasn't invested in it.
Matt actually revealed during the reunion special on Wednesday night he had a feeling his marriage wasn't going to last 15 minutes into it.