Once "Decision Day" rolled around after the extreme seven-week experiment, the couples -- matched by Married at First Sight experts Pastor Calvin Roberson, Dr. Jessica Griffin, and Dr. Pepper -- had to figure out whether they wanted to stay together or go their separate ways.
AJ and Stephanie ultimately chose to stay married, as did Kristine and Keith.
However, Kate and Luke broke up, which fans probably saw coming based on Luke's cold attitude toward Kate and the lack of attraction he had towards his wife.
Will and Jasmine also decided to get a divorce, but Jasmine appeared heartbroken as she was hoping to make things work with her husband long-term.
The Married at First Sight broadcast began on "Decision Day," with each individual waking up in bed alone in the Philadelphia area.
Each couple was asked to part ways for the night and sleep separately in order to sort out their feelings and emotions about marriage.
AJ told the cameras he wanted to be with Stephanie and was hoping she'd want to be with him too.
"If this doesn't work out in my favor, I would be devastated, because I don't want to go back to eating dinner alone. But nothing in life is guaranteed, except death," AJ said in a confessional.
Stephanie, however, didn't like how AJ's frustrations often got the best of him. She worried about his anger and whether that would impact their relationship negatively forever.
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AJ and Stephanie then sat down with the three experts to reveal their final decisions.
AJ gushed about how happy he was with Stephanie and how his focus in life changed from being selfish to caring about her.
Stephanie said she can handle a lot but AJ's outbursts would wear on her when they continued past him making his point.
AJ then announced his final decision, telling Stephanie, "Seven weeks ago, I got to say, 'I do,' to Married at First Sight without knowing my wife. Today, I get to say, 'I do,' to the person who is my wife now that I know her. And I couldn't be more happy about that."
"I choose to stay married to you for the rest of my life," he added.
Stephanie didn't appear happy or pleased. She said part of staying together was "forced" and she hoped they could continue a strong relationship on their own, away from cameras and the experts.
"That being said, I want to stay married to you," Stephanie told AJ.
The couple sealed the deal with a kiss, and Stephanie said she loved how safe she felt with AJ.
"I can't imagine what life would be like without him. I love him! He's great," Stephanie said, confirming she loved AJ and he's "the best."
AJ revealed he was on the same page as his wife but he wanted to be a bit more private when it comes to saying, "I love you," to his wife.
AJ noted it felt incredible to be married, but Stephanie said they'd have to push communication going forward in order to keep things on a positive note. They were both optimistic about the future.
Pastor Cal told the cameras AJ and Stephanie loved each other the way they needed to be loved.
On the morning of "Decision Day," Will said he did a lot of thinking the previous night and had finally arrived at his decision.
Will was "feeling good" in his marriage and thought Jasmine could be the person with whom he'd like to spend the rest of his life.
Jasmine also thought Will was great and enjoyed laughing with him, but their romance was filled with ups, downs and some confusion.
Will revealed to the experts the best part of his marriage was becoming best friends with Jasmine, but she said they had "emotional connection issues," which goes hand in hand with the lack of "a sexual connection."
Jasmine said they often disagreed on and debated things when Will just wanted her to agree with him.
On the topic of gender roles, Will acknowledged they didn't see eye to eye and he never wanted Jasmine to sacrifice in a marriage because that could lead to resentment.
Pastor Cal thought Jasmine put her whole heart on the table and saw potential in her marriage, so Pastor Cal was pretty upset.
"I think you're missing out on a lot because what she can contribute to your life would be stratospheric," Pastor Cal told Will.
Will felt bad about hurting Jasmine because he had feelings for her, but he hoped once her emotions subsided she would realize a divorce is best.
"I am definitely disappointed because I think Will had a timeline on our marriage. I think it was a seven-week countdown for Will, and if his needs weren't meant in every way in that seven weeks, that he would have chosen to get a divorce. I feel it's a little selfish on his part and it's upsetting," Jasmine said in a confessional.
As for Kate and Luke, he wished they had talked more about "Decision Day" before going into it.
Luke only wanted to get married once in his life and hoped Kate was on the same page. Meanwhile, Kate explained she really liked and cared about Luke -- even after "all the bad stuff" they had gone through together.
Kate wasn't sure if she and Luke were making progress or if their marriage was a lost cause.
Once Kate and Luke met on a couch and joined the three experts, Luke told his wife he had enjoyed getting to know her and the fact she laughed at all his jokes.
Kristine and Keith then sat on the couch together in front of Dr. Jessica, Pastor Cal and Dr. Pepper.
Kristine expressed how being married to Keith was challenging, exciting, frustrating and worthwhile. She said they took a risk by tying the knot but tackled any issues that came there way.
After Kristine thanked Keith for all of the effort he was putting into their relationship, Keith gushed about how Kristine had made him a better man.
"I've got to do pushups and I've got to cook, but I'm learning to love it," Keith noted.
Kristine told the experts she wasn't ready for children and feared making a decision based on what could just be "a happy period" of their relationship and her life.
Kristine was trying to think long-term rather than just base a lifelong choice on a matter of weeks.
"Married life has been a roller coaster for me, I'll be honest," Kristine announced.
It then became time for the pair to announce whether they wanted to stay together or get a divorce, and Keith's decision seemed obvious.
"Kristine, you bring out the best in me and it's like I'm evolving into a greater person," Keith told his wife.
"I feel like if you keep pushing me and lighting that fire under me, I'll be amazing one day. So, I'm going to say, 'I do,' again to Kristine. I want to stay with Kristine."
As for Kristine, she declared she would like to stay married.
The couple then smiled at each other and Kristine said, "We started something great together and I think it's done nothing but blossom since the day we met. I feel like we can continue to create something great."
Keith then told Kristine, "I can really say that I love you."
Kristine was speechless and started to cry, and then after a few seconds, she said, "I love you too," and kissed him.
Pastor Cal joked they should get a room, and Kristine gushed about how taking a huge risk had paid off and Keith was her huge reward.
"I want to be with her forever," Keith noted.
Dr. Jessica admitted she wasn't surprised Kristine and Keith had decided to stay together because they had chemistry from the beginning and worked incredibly hard on their marriage.