“Keeping Up With the Kardashians” star Rob Kardashian seems to be taking his sister’s side after rumors that Lamar Odom cheated on Khloe Kardashian began to swirl on the Internet. The reality star is known for being the sometimes-whiney little brother on the show, but according to a new report by Radar Online, Kardashian confronted the athlete face to face to see if the rumors were true.

Fans of the show and the infamous reality family know that Rob, 26, has a close bond with his brother-in-law, but a source told the celebrity magazine that Khloe’s interests are what matter most to him.

“Rob confronted Lamar and it got heated very, very quickly. Rob and Lamar have been close since he came into Khloe’s life,” the source told the website.

“When Rob asked Lamar point-blank if he had cheated on Khloe with criminal defense attorney Polina Polonsky, he refused to answer the question. Rob grew angrier that Lamar didn’t respond, and he ended up just leaving the house. A lot of people bash Rob, but he truly has his sister’s back and is very protective of her.”

Two other women have come forward in recent weeks saying Odom had affairs with them. Stripper Jennifer Richardson recently alleged that Odom had a foot fetish. She also said she was being “stalked” by Odom. 

“Rob has been continuing to stay with Khloe, and has been a big source of support for her at this very difficult time,” the source finished.

Apparently Khloe kicked her husband out of the house but has been talking to him every day and visiting him in the hotel where he has been staying, Wetpaint.com wrote.

“KUWTK” is in its eighth season and airs on E! every Sunday at 9/8c.