According to Wikipedia, for high income earners, the divorce rate after 10 years is 23%... Or about 1 in 4.
If I understand correctly, the idea is that the separation should be equitable (which makes sense as you were building a life together). However, this varies if there are kids involved.
I fully support this if it works both ways, ie. Regardless of gender.
You are either surrounded by friends with low income (who divorce at 44%), or You are suffering confirmation bias.
None of my friends have divorced - but that's luck more than anything else.