'She's touching MY husband!' Seven Year Switch star threatens to 'kill' her spouse's temporary wife after seeing the pair drunkenly flirt - as he admits he is thinking about cheating

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No one said swapping spouses would be easy, but one Seven Year Switch star has vowed to 'kill' her husband's temporary wife after seeing footage of them flirting and getting drunk together. 

On Tuesday night's episode of the FYI reality series, Jaclyn and James were shocked to see just how well their spouses Dustin and Kelsey were getting along only four days into the unique couples therapy. 

'It's kind of like James and I, we're here by ourselves working on our marriages while our spouses are out getting drunk every day,' Jaclyn told the cameras. 'Yep, that's exactly what it is.

Big trouble: Jaclyn threatened to 'kill' her husband Dustin's temporary wife Kelsey on Tuesday night's episode of the FYI reality series Seven Year Switch 

Too close for comfort: Jaclyn and Kelsey's husband James (inset) watched footage of their spouses shamelessly flirting 

'I feel angry. I feel jealousy because she is touching my husband, and that's inappropriate. I'm going to kill her,' she added. 

One of the show's relationship experts, Jessica Griffin, had stopped by their new homes for a check-in, and at the end of the session she showed Jaclyn and James a video of their spouses on their first night together.

While James looked filled with despair, Jaclyn counted every drink Kelsey had, but interestingly enough, she didn't seem to be as upset with her husband Dustin's inappropriate actions. 

The two were much happier with the experiment when they didn't know what their spouses were up to. 

Disappointed: While James looked dismayed, Jaclyn counted every drink Kelsey had and said it was inappropriate that she was touching her husband 

On their first morning together, James made Jaclyn eggs, something she said Dustin would never do for her.

'It's nice that James wants to be with me. Dustin and I are totally disconnected right now,' she admitted to the cameras.

The two went for a run, and she noted that Dustin runs really fast and refuses to wait for her, so they no longer do it together. 

At the end of the night, James and Jaclyn chowed down on hot dogs as they discussed his hot dog business, and he admitted that Kelsey was more concerned with spending his money than supporting his dreams.

Better life: Earlier in the episode, Jaclyn was touched that James made her eggs for breakfast

Keeping pace: Jaclyn was thrilled James jogged alongside her, noting that Dustin usually speeds right past her 

Getting closer: The two discussed Dustin's hot dog stand business, and they bonded over their spouses' lack of support for their dreams 

Jaclyn had similar frustrations, and at the end of the night she asked James if he wanted to sleep in the same bed instead of on the couch. 

The doting husband refused, but she told the cameras she 'would mind' if he had wanted to.

Meanwhile, Kelsey and James went to the gym together, and he showed her moves from his MMA fighting days. 

When she punched his abs, she flirtatiously exclaimed that they felt like 'cement'.

Flirting: Dustin took Kelsey to the gym to teach her some of his MMA fighting moves, and she gushed that his abs were as hard as 'cement' 

Fun for her: After the gym, Kelsey taught Dustin how to make at-home face masks 

'I'm hoping he'll get a little rough because I'm into that,' she told the camera, although it's not quite clear exactly what she meant. 

The two later discussed their sex lives and confirmed that they were both more adventurous in the boudoir than their real life partners.

Kelsey was genuinely surprised when Jessica showed up at their door, but that didn't stop Dustin from cracking open a beer. 

Things only got worse when she asked them how things were going.  

Caught off guard: Dustin and Kelsey also had a surprise visit from the show's relationship expert, Jessica Griffin 

Feeling flirty: Both Kelsey and Dustin revealed that they are attracted to each other, and he admitted he was afraid he was going to cheat on Jaclyn 

'Maybe too good,' Dustin confessed. 'I went from a situation where I never thought about another girl and now I am thinking about another girl, you know?'

Dustin explained that cheating or a fear of cheating has never been an issue in his marriage with his wife Jaclyn, but this form of therapy has changed that.   

'I have been put in a situation now where I have to watch myself,' he said. 

When Jessica asked him to confirm that there was some attraction between him and Kelsey, he doesn't hesitate before saying 'definitely'.   

'Look at her. Why wouldn't there be?' he asked, and Kelsey began to giggle and blush. 

Not right: 'I almost feel like I am sitting with two high schoolers in puppy love and not two married adults,' Jessica said of Dustin and Kelsey 

Not happy: Jaclyn and Dustin were annoyed watching James and Jaclyn bond about how they have to 'parent' them 

Meanwhile, Kelsey told Jessica that Dustin is 'super hot, super fun' and adventurous, noting that she is really into the 'bad boy' persona he is giving off.   

'For Kelsey and Dustin to have gotten so close so quickly to be this comfortable with each other, you wonder have boundaries been crossed,' Jessica told the camera of her assessment. 

Jessica said she felt like she was in a room with 'two high schoolers in puppy love', and when she asked them they are scared of, Dustin said it was 'cheating'.  

'If it happened, it happened, you know, and it's one of those things that you don't recover from it. There is no recovery from cheating,' he said. 

Working up a sweat: Aaron and Liliya bonded over their shared passion for fitness 

Yuck: Neither of them could cook, so they ordered takeout, but they were disappointed by how horrible it tasted 

Dustin also noted that he was holding back because if he went out and partied hard like he usually would, he would find himself in trouble when he came home to his new wife.   

'I know as soon as I do that, I'm not going to have control of my emotions and I am going to come back to a house with her,' he said. 'It's new. We haven't done it over and over.' 

When Jessica announced that they would be watching footage of their spouses interacting, Kelsey was more concerned that they would be watching a video of her and Dustin. 

Despite their borderline inappropriate behavior with each other, both she and Dustin were annoyed about James and Jaclyn talking about how they have to parent them, and Kelsey called them 'a******s'.

However, things weren't quite as rocky for the other couples. Aaron and Liliya continued to bond over their passion for their careers and their love of working out. 

Change of heart: Both Liliya and Aaron wished their spouses would be more ambitious 

Feeling sad: Liliya looked upset when she watched her husband Tony explain how she doesn't really support him 

Liliya noted that her real husband Tony doesn't push her physically, and Aaron was impressed that his new wife was once a fitness trainer as well as an ER doctor.  

But after their workout, they once again they were forced to get takeout because they realized that neither of them could cook like their spouses. 

Liliya tried to spice things up and get some Russian food, so she could share some of her culture with Aaron, but the food wasn't very good. 

It was when she was munching on a subpar meal that she missed her husband Tony and realized she would be lost without him. 

After Jessica showed them footage for their spouses interactions, Liliya looked visibly upset about Tony's comments regarding her lack of support.  

A lot of emotions: Heather broke down in tears over being away from Aaron, even though she assured Tony that she was happy to be paired up with him

Pick me up: Heather later took Tony surfing, an activity she knew Aaron would never do with her

Taking a dip: The two hopped in their home's hot tub together for the first time, and Tony realized it was an activity he had never done with his real wife 

Meanwhile, Heather burst into tears after her first night with Tony, explaining that even though he was wonderful, she had never been apart from Aaron for so long. 

Despite her discomfort, she took Tony surfing, an activity she knew Aaron would never do with her. 

Even though Tony wasn't exactly thrilled about the activity, he admitted that he and Liliya hadn't done anything fun like that since their honeymoon. 

When they returned home, the two hopped in the hot tub and Tony admitted that he was attracted to Heather and her 'beach-ready bikini body', even though it felt weird saying it because he was a married man. 

However, he became worried that Liliya would get angry with him because they had never been in a hot tub together, and he questioned if he had crossed a line.