kimkregsplitup.jpg Though Kim Kardashian and her steady boyfriend Reggie Bush have called it quits yet again, it looks like this may not be the end to their romance.

Cheating rumors hit the web this afternoon, alleging that the NFL star had an affair with a waitress, but a source for Life & Style says the reason behind the breakup was the difference in maturity between Kim, 29, and Reggie, 25. “Kim is a sophisticated businesswoman,” the source explains. “Reggie’s just like a big kid. He’s not grown-up enough for her at the moment.”

The source adds that the breakup doesn't mean things are over for good. “Should they decide to stay together, it will require time and hard work on both sides,” the pal says. “Their families are rooting for the romance to work out.” Another source tells the mag, “He’s definitely had a marriage conversation with Kim’s mom, Kris, and stepdad Bruce. But he’s like a child; it’s doubtful it was formal. So either there will be a ring - or they’ll be finished.”

Think this is the end? And what about those cheating rumors?