Reggie Bush (L) and TV personality Kim Kardashian arrive at the premiere of Dreamworks' "Transformers: Revenge Of The Fallen" held at Mann Village Theatre on June 22, 2009 in Los Angeles, CA. Kevin Winter/Getty ImagesUs Magazine Kim Kardashian and Reggie Bush have split, her rep confirms to Usmagazine.com."Nobody cheated," a source close to the couple says. "This is just a case of conflicting schedules and their lives going in different directions.See who else is single this summer."It was a totally mutual decision," continues the source.The reality star, 28, began dating Bush, 24, the running back for the New Orleans Saints, in April 2007.Look back at Kim and Reggie's most romantic moment.In June of this year, she denied rumors of an engagement, as falsely reported by tabloid Star."I am not engaged!" she wrote on her Web site. "The rumors about me picking out my ring already are also not true! I don't know where all this comes from!!" See Kim's sexiest red carpet shots.But last December, she told Us "of course, I would say yes!" if Bush proposed.When asked about marriage, Kardashian told Us then: "We are totally happy, and we have a great relationship, and it's definitely where things are heading. But hopefully it will be a surprise!".