During a Tuesday night appearance on Married at First Sight: Unfiltered, which is hosted by Jamie Otis, Luke watched back a clip of his mother asking Kate how she would feel if her relationship with Luke didn't work out as she had hoped it would.
Kate admitted Luke's mother was acting as if her marriage had already ended, and so she thought to herself, "If nobody thinks this is going to work out, why are we even talking about this anymore?"
Kate appeared deflated and depressed in the footage, saying she put all of her effort into the marriage but her expectations weren't being met.
Luke then started to cry on Unfiltered and told Jamie, "My mom knows pretty much what is going on at all time."
"I think it's very telling if you are chatting with your mom every day and she feels like the marriage is at its end," Jamie pointed out, adding that this conversation went down after Luke had already expressed he's not physically attracted to Kate.
"This was -- I don't know. I went in so hopeful but it was just not what you'd expect," Luke said, choking up.
Jamie admitted it didn't make Luke look good when he delivered "blow after blow after blow" to Kate -- which included accusing her of drinking too much.
Luke emotionally lamented, "It's fine," but Jamie said it wasn't okay because he was failing to take advantage of an opportunity to express his feelings.
One instance Kristine seemed to be referring to was when Luke told Kate their first post-wedding kiss was "repulsive" and made him feel "dead inside." Although fans did not see Luke say that on tape, Kate vented about the situation once cameras started rolling again.
"What the hell were you doing?" Kristine asked.
"I don't know," Luke admitted. "I don't know."
Jamie then asked Luke what was going through his mind when he told Kate that he was feeling dead inside and repulsed after kissing her.
Luke laughed nervously, prompting Jamie to push, "Explain that to us, because honestly, that was the start of the whole downward spiral, and there's got to be a reasonable explanation."
Luke appeared to be on the verge of tears as Jamie probed for answers, and he continued to laugh nervously while playing with his hands and looking at Dr. Jessica for backup.
"You can answer what you're comfortable with," Dr. Jessica said.
Luke sighed a breath of relief and said, "Okay," before asking to take a break.
Dr. Jessica pointed out he could take a break or they could just move on from the subject entirely.