Kim Kardashian: Too Mature For Reggie Bush

Kim Kardashian and Reggie Bush may be back together someday, but they're over now. Here's why, according to the venerable publication known as Life & Style.

An insider reveals Kush split shortly after their Costa Rican getaway in early March: "It was a make-or-break vacation, and things just didn't work," a source says.

According to sources from both sides, the biggest reason behind their surprising breakup was the difference in maturity between Kim, 29 and Reggie, who's 25.

Yes, Kim Kardashian is being described as more mature than someone.

"Kim is a sophisticated businesswoman," an insider says of the professional celebrity. "Reggie's just a big kid. He's not grown-up enough for her at the moment."

IT'S OVER: But is the split for good this time?

A friend of the couple says it could go either way at this point. "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."

What happens next could depend on Reggie Bush growing up ... or not.

"He's definitely had a marriage conversation with Kim's mom. But he's like a child; it's doubtful it was formal. So either there will be a ring - or they're finished."

To his credit, he did take to Twitter this week to deny cheating on Kim. Sure, an in-person conversation might have been better, but the effort was there!