He was unhappy? So what did he do to change that? How much happiness did he bring into the R on a daily basis? Was he relying on you to make him happy?
I think happiness comes from the inside, for the most part.
It sounds like his wish and failure to enforce his standards onto you is what made him unhappy.
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17