Apparently not - Belgium's divorce rate is roughly the same as the EU average:
File:Crude divorce rate, selected years, 1960-2015 (per 1 000 persons).png - Statistics Explained
What you've got in that article is a
very poor use of statistics. The only way you get a 70% divorce rate in Belgium is if you divide current marriage rates with current divorce rates. But,
that's not the divorce rate. That's just the present ratio of current divorces to current marriages.
Which is a different thing entirely.
Marriage rates in Belgium have been declining for the past ~60 years. In the 1960s and 1970s, people were getting married at twice the rate they are now. Meanwhile, divorce rates have gone up, roughly by a factor of four.
So, less and less people are getting married, and more are getting divorced. Which makes it appear that the divorce rates is really high, when actually it isn't. It's the ratio of divorces to new marriages that is very high, not the overall divorce rate.
In Belgium, the average interval between a marriage and divorce is 15. So, if you look at the data from the early 2000s and compare it to the number of divorces now, you actually end up with a divorce rate of about to 50% to 55%.
Or, if you look at divorce rates per 1000 people, its about 2.2. Yes, that's still on the high side, but not exceptionally so. In fact, its lower than the US - which is about 3.2 per 1000 people. Its just that people in the US are getting married about 80% more than in Belgium.