Maybe think about things from your wife's perspective. Why would she be upset or unhappy?
Would she say you've been critical? distant emotionally? Always trying to fix things instead of listening to her? Not helping around the house enough? controlling?
It's important to attempt to identify what she would say or think, regardless of whether you think those things about yourself.
Me: 36 W: 40 S: 4 Together 10 years, Married 8 BD and Seperation: 8 June 2017 Financial/Custody Filing by her: 25 Aug 2017