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The blogs are abuzz this week that on-again couple Kim Kardashian and Reggie Bush are on the rocks.

The truth?

The two "aren't sure where their relationship will go," a source close to the couple tells

Bush, a 24-year-old running back for the New Orleans Saints, and Kardashian, 29, have been dating since 2007 before her E! show Keeping Up With the Kardashians became a huge hit. (They briefly called it quits last year.)

"Her fame is just a little too much for him to handle," the source tells Us. "She travels the world and has created brands. He just can't keep up. They are unsure of what will happen in the future."

Should they part ways for good, the source insists they will keep things amicable.

"Kim doesn't want to seem upset or heartbroken," adds the source. "She is enjoying her girl time in Miami."