Well, people may be lucky to know you, but that's not why they're still married. This number is based on the fact that there are half as many divorces occurring in a year as weddings in the same year. It's like saying that since there are half as many deaths in a year as births, that half the babies born in any one year will die. So if you know four married couples, one of them will get a divorce.
Any divorce is still a tragedy, of course.
While simply being married doesn't increase your chances of divorce as the common statistic suggests, there are some indicators to predict divorce rates. The best indicator seems to be a shared experience of faith. News about Domestic-Church. Recently posted material. Resources for the family.