Kourtney Kardashian cries as Kim Kardashian feud erupts after Travis Barker wedding: 'It just upsets me'

Fans are starting to see why there's tension between Kim Kardashian and Kourtney Kardashian. On the latest episode of The Kardashians, Kourtney vented to Kendall Jenner about why she's upset over Kim's collaboration with Dolce & Gabbana.

"While we were at our wedding, I guess Kim was having these conversations with Dolce that I didn't know about," Kourtney began.

Kourtney and Travis Barker both wore Dolce & Gabbana when they said "I do" last May. In fact, the fashion house created looks not only for the happy couple, but the whole KarJenner clan. Some even speculated the designers sponsored the lavish weekend, which Dolce & Gabbana denied.

On The Kardashians, Kourtney shared how she had a close personal relationship with Stefano Gabbana and Domenico Dolce for years, which is why she went to them to curate her wedding looks. So, how is Kim entangled in all of this? Shortly after Kourtney's wedding, the Skims co-founder was asked to creative direct Dolce & Gabbana's show at Milan Fashion Week. Season 3 picks up as Kim prepares for the event.

"I just feel like there's... such an abundance of opportunities," Kourtney cried. "Sorry, it just upsets me."

"I hate that it affects you this badly," Kendall said.

"It's not about business, there's so much and it takes precedence over hurting your sister. It's legit copying my wedding," Kourtney explained. "It's stupid because it's a deeper thing that it's about. It's grabbing whatever's in the way. It's, like, such an abundance, or an excess, it's never enough, it's never just OK to not do something, or turn something down because it doesn't make sense."

An emotional Kourtney claimed that Kim "wasn't happy at my wedding" while everyone else said they had the "best time."

"She can never give acknowledgment like, 'Whoa this is so amazing, I love this whole vibe,'" Kourtney said, claiming Kim never hinted she was interested in some sort of partnership with the designers at the time. The reality star added that she would "never" tell "someone not to do something."

"I think it's also subconscious. I think [Kim] sees everything that I had there and takes it for her own and she doesn't even see it," Kourtney continued. "She sees it as the dollar signs, but to me, I see it and I see it like 'Oh, you were there, you weren't happy.'"

According to Kourtney "everyone said something" about Kim "spiraling" during her wedding.

Kourtney went on to say how she's upset with momager Kris Jenner's lack of communication about Kim's business opportunity. "Mom never mentioned it to me," she exclaimed.

"I don't think it's fair how it was handled," Kendall agreed.

"Mom feels like she has — like she is entitled almost, like she doesn't have to get my permission," Kourtney said. "If I did it to Kim, she would freak out."

Kourtney continued, "For me it was more personal. I think that's why it, like, hurts my feelings. It was my actual wedding. The year your sister got married, you then made a deal to do this fashion show. Don't do it the same year that comes out four months later. It's not like I did their campaign and then she did the campaign right after. Like, who cares? That's business. It's my actual wedding and that wasn't a business deal for me. I did it because it felt really personal."

Kourtney made her displeasure known on her family group text when Kris pushed everyone to promote Kim's Dolce & Gabbana shirts.

"That just, like, set me off. Like does no one see anything that this feels weird?" Kourtney lamented. "This actually feels really unauthentic to me, and I can't fake it, and I don't feel like supporting this. And then I haven't talked to mom about it since."

"I think that's what sucks the most though, is you talk about how special, you know, you felt in the moment of your wedding and just how it deflates it all when she does that right after," Kendall agreed. "It's crazy, everyone's crazy."

The episode ends with Kim getting ready for the show in Milan. She had Kris and Khloé Kardashian in Italy for support.

"Did you see um, Kourt's stuff?" Khloé asked.

"No, is she so mad at me?" Kim replied. "She's mad at me?!"

"Mad at mom, everyone. She's — it's crazy," Khloé added.

"About what?" Kim asked. "Me doing this?"

"Loyalty," Khloé replied. "It's wild."

"Wow," Kim said.

"It's not rational," Khloé exclaimed.

"She's mad that I'm doing the Dolce thing," Kim said, trying to process the whole thing.

"She didn't say specifically you it's... it's not nice, on her end," Khloé added.

In her confessional, Kim claimed that was the "first time" she heard that Kourtney was upset.

"I couldn't have been more mindful," she stated. "I said... don't do anything that Kourtney wore to her wedding out of respect for Kourtney. She doesn't know that I have the email string begging them to push it a year."

Kim continued, "What I've realized in this lifetime is that everyone has their own truth of how they think something happened. It's weird, you know, but it's all going to come out on the show. This is our therapy."

New episodes of The Kardashians drop Thursdays at 12 a.m. ET on Hulu.