Rob Kardashian had flown to Europe to watch his sister Kim Kardashian wed rapper Kanye West only to head back to Los Angeles before the two exchanged vows, sparking curiosity about what caused his change of heart.

Rob Kardashian Leaves Kimye Wedding Due To Weight-Gain

Kardashian, 27, was bombarded by paparazzi as he entered Los Angeles International Airport with his mother, Kris Jenner, last week. It was the first time the entrepreneur had been spotted in months, as he was supposedly staying out of the public eye intentionally while he tried to shed weight. The photos of him, which revealed he’d yet to lose the pounds, soon went viral with headlines poking fun at his size.

Amidst the media frenzy, Kardashian took to Twitter to confront those talking about his weight gain and to shut down the rumors that he’d been in rehab or at a fat camp. His sister, Khloe Kardashian, joined him on social media to point the finger at those fat-shaming her brother.

It’s believed that the focus on his weight is what made Kardashian make a hasty exit, heading home before the wedding and not attending the rehearsal dinner the night before. Apparently, a family feud was not to blame for his decision to skip the ceremony.

"He is really overweight and having a hard time with it," a source told People magazine. "There was no big fight between him and Kim. This was just a decision he made."

Upon returning to the U.S., Kardashian reportedly contacted his trainer Gunnar Peterson with renewed ambition to shed the extra weight. “Rob is locked and loaded,” Peterson told TMZ, revealing that he’ll have Kardashian doing intense daily workouts until he’s back in shape.

For More Kardashian News:

_{> Kim Kardashian And Kanye West Get Married In Lavish Italian Wedding}

_{> Kim Kardashian Blogs About Her Daughter And Racism}

_{> Kim Kardashian Instagram Fraud: Passing Off Google Image Results As Personal Snapshots?}

_{> Rob Kardashian Is Not In Rehab, Contrary To Multiple Reports}