Leading in to the finale, Natalie and Shayne were in a good place. Both stars shared that they were definitely going to say yes on their wedding day in their individual confessionals.

Once viewers caught up with Natalie on the big day, she had changed her tune — and she was no longer as certain about her engagement. She revealed that she had gotten into an argument with Shayne the night before. She shared that he said things that were making her question their entire relationship.

"I'm nervous, I'm stressed. Last night, Shayne and I got into a fight. It was a really bad one, and he said some hurtful things to me. I asked Shayne, 'Do you think you, like, maybe had a little bit too much to drink?' And he just got really, really angry at me..." she said. "I still love him, and he's still my best friend. I don't know."

While Natalie was rattled by the pre-wedding argument, Shayne didn't appear to be as bothered by it.

"During the argument, I think everyone says stuff they don't mean, most of the time," Shayne said.

When a producer asked what happened, Shayne replied that he didn't want to discuss the disagreement.

"I don't want to talk about the fight, dude," he said. "You know, she's my best friend, the person I see myself with [for] the rest of my life. Ideally, we both say yes, and we start our new life together outside of this experiment."

He discussed the matter with his friends, and he said that he had "of course" gotten into a fight with Natalie right before their wedding. He recounted what went down once they started bickering.

"Then, from there, I basically said, 'With what you say about me, why would you want to marry me anyways?'" Shayne described. "I'm like, 'I just don't think we should get married now.'"

While Natalie wasn't sure what to do leading up to the ceremony, she ultimately decided not to get married. She told Shayne that they had too many big issues to work on in their relationship.

Once Natalie chose not to say yes to Shayne at the altar, the two had an emotional interaction at their wedding venue.

"We can still try to work on this," Natalie said to her ex-fiancé. "I'm not closing the door on us."

Shayne wasn't as convinced that they could still be together. After some back and forth, the reality stars eventually discussed the elephant in the room. They shared what exactly Shayne said during that argument, and Natalie had a different point of view.