Kim Kardashian And Kanye West's 2014 Wedding: Rob Kardashian Skipped Wedding, Returned To Los Angeles

Rob Kardashian flew to Paris last week, but reportedly didn't stay in town for his sister's wedding to Kanye West.

Although Rob stepped out for the first time since January in order to fly to Europe for his sister's big day, the pressures of having to appear at the wedding festivities ultimately proved to be too much for him to handle.

"Rob did come to Paris but skipped [the rehearsal dinner at] Versailles and the wedding," a source told PEOPLE Magazine on May 26. "He just didn't want to see a bunch of people both nights and really just is not feeling like himself."

While the Keeping Up With The Kardashians star has been working with top celebrity trainer Gunnar Peterson for months (and even seen working out with him at his Paris hotel over the weekend), he just can't seem to lose weight as he'd like. On the show, fans watched as Rob took on a strict diet and began working out, but in the months since filming wrapped, he doesn't appear to have lost much weight—if any.

"He is really overweight and having a hard time with it," the source explained of Rob's mental state.

In a second report by TMZ, another source claimed that Rob's absence was the result of not wanting to appear in photos with his family and other guests, calling the sock designer "insecure and depressed."

According to the TMZ source, the Kardashian family made their best effort to support Rob, but in the end, he wasn't feeling up to attending the wedding and decided to fly home.