Khloe Kardashian has revealed that sister Kim Kardashian was the one who broke the news to her about then-boyfriend Tristan Thompson's infidelity last year. The pair opened up about that conversation, with Khloe noting that she's grown to be "more numb" in regard to her ex's philandering.Last year, a former fitness model named Maralee Nichols filed a paternity lawsuit against Tristan, claiming he impregnated her. The NBA player initially denied the allegation, but later admitted to having several sexual encounters with Maralee.