Are you wondering what led to Kristin Cavallari and Jeff Dye's breakup? According to E!, a source close to Cavallari revealed the reason for their split. The insider told the outlet that the relationship "was never that serious to begin with," adding, "She was having fun." Another insider close to the former couple told ET the same thing, revealing, "she enjoyed Jeff's company and he made her laugh, which she loved, but she never really saw anything long-term happening between them, especially with co-parenting being such a new thing for her right now. She's focusing on the growth of her business and her kids. A serious relationship was never top of mind, at least for right now."

So, it appears that Cavallari and Dye's relationship was more of a rebound for the Very Cavallari star than anything too serious. It looks like she's just enjoying being a single mom and seeing what is out there. We don't blame her one bit.