Kylie Jenner and boyfriend Tyga have reportedly split for good and the “Keeping Up With The Kardashians” star’s big brother, Rob, is not taking the news lightly.

“Rob‘s fed up with Tyga hurting the women in his life,” a source told Hollywood Life. “He’s had enough Of Tyga‘s games and has made that very clear to Tyga and told him to pump his breaks.”

The 26-year-old rapper is clearly trying to lure and win Jenner back but Rob Kardashian is not going to let that happen.

“Rob doesn’t want Tyga bombarding his sister with phone calls, showing up at her house, sending her gifts, none of that.,” the source added. “He’s explained to Tyga that Kylie needs time to be alone and to breathe. Rob demanded Tyga respect his wishes.”

Rob Kardashian is close to all of his sisters’ partners, including Kanye West, Scott Disick and Lamar Odom. Although his involvement with Blac Chyna started a relationship web with Tyga and Jenner, Rob Kardashian accepts the rapper, unless he crossed the line.

“Rob‘s very loving and he gets along well with everyone,” the source shared. “But if you cross him, especially by hurting those close to him, there will be problems. Tyga‘s walking a very thin line.”

Sources told TMZ that Jenner and Tyga separated “acrimoniously” in the lead up to the Met Gala, which took place last Monday, and that explains why they did not walk together.

The reality star and Tyga are thought to have started dating in 2014 but they didn’t go public with their romance until late 2015 when Jenner turned 18.

Multiple reports noted that the on-and-off couple has broken up at least 10 times in the past, but always got back together shortly afterwards.

According to Entertainment Tonight, Jenner hinted at her emotional state in a series of Snapchats on Wednesday night, revealing that she felt “vulnerable” and saying she didn’t “know who Kylie Jenner is.”