They do seem to always have had an, ahem, turbulent relationship. Sad though; their children are very young - Dexter's only 16 months.
The Daily Mail analysis (I know, I know ) was that her career was on the up again and since he's not played rugby for over a year and looks unlikely now to ever reach his previous standard, he got resentful.
And yes, the engagement announcement was only in OK! a few weeks ago. In fact I think it only went into my recycling bin the other day.