Zellweger and Chesney Split

I wasn't particularly interested in this story until I saw the line: "Though her annulment papers cite 'fraud,' Zellweger says its 'not a reflection of Kenny's character.'" Well, that's a relief. According to Ms. Zellweger, her representatives were just using fraud in the legal sense, which of course is vastly different from how fraud is normally meant. But why did she want to file for divorce? Because there was a "miscommunication of the objective of their marriage." What the heck does that mean? As far as I know, the objectives of marriage are pretty limited. Did one of them want to have a good excuse not to get together with an old boyfriend/girlfriend? Was Renee finally tired of the "Zellweger"? These are some important questions, and I'd like answers.