It USED to be very few men who filed for divorce first. Now the numbers are 60/40 if not 50/50. Of the men who file for divorce, I would anedotally divorce court observations say that NAGGING is a major factor. (that and really bad sex lives)
NAGGING and constructive criticism isn't even spelled alike.
Nagging by either spouse is a 100% guarantee to take the marriage downhill.