What would push a brother not to attend his sister's wedding?

Kim Kardashian appeared on "Watch What Happens Live" and talked about why her brother Rob skipped out on her wedding in Florence, Italy last year.

Explaining to host Andy Cohen, the 33-year old reality star shared that she is very close to her brother and that he is one of her best friends. However, like how relationships go sometimes, the two had gone through a hiccup.

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Rob flew with the Kardashian family to Italy to partake in his sister's wedding; however, at the last minute, Rob decided to leave and fly back to the Unites States before the nuptials.

Kardashian defended his move, saying that Rob actually wrote her a long email, explaining why he didn't want to attend her wedding. Rob, who has been going through very public issues, including gaining a massive amount of wiehgt, didn't feel comfortable with the amount of people invited to the wedding. Rob simply didn't want to be talked about, so he decided to relieve himself of the limelight and go back home.

Kardashian, now married to rapper Kanye West and a mother to North, shared that she was disappointed but understood.

Cohen then stated that a lot of people disagree with the way Kardashian has been handling Rob's issues.

While her other siblings and mother Kris Jenner cry and feel sorry for Rob, Kardashian has chosen to criticize him.

In a Thailand vacation featured on "Keeping Up with the Kardashians," sister Khloe felt extreme sorrow that her brother wasn't part of the trip, while Kim focused on taking one sexy selfie after another.

"I'm definitely a tough love kind of person. If I don't like something that's going on in my life, I change it, and I don't sit and complain about it for a year," Kardashian stated, "I try to encourage him. And once you don't just make that change for so long, and it's not happening, I get frustrated. My patience runs out." 

TagsKim Kardashian, Rob Kardashian, wedding