Though he has yet to publicly address the news, according to a source, Rob, 31, is “furious” at Thompson, 27, for allegedly cheating on his sister Khloe Kardashian, 33, throughout her pregnancy.
“Khloé has always been there for Rob and he hates that she was hurt — he knows what it feels like to be screwed over by someone you trusted,” says the source of Rob, who has an infamously rocky history with his ex, Blac Chyna.
Adds the source: “Rob won’t forgive Tristan for this.”
And Rob’s not the only member of the famous family outraged by the news: On Tuesday, a source told PEOPLE that Kim Kardashian West, 37, and her husband Kanye West, 40, are also upset with the NBA star.
They both feel Khloé has gone through so much and that she deserves being happy,” said the source. “They can’t believe that Tristan has been going behind everyone’s back. They find his behavior disgusting.”
“Kim is very protective of Khloé and is especially upset,” added the source. “She can’t imagine Khloé will stay with Tristan, but will support her sister either way