i do think it's very interesting how you describe your marriage/life.
if i described my marriage/life, i would say things like, we get on well, are a team, laugh together, love to lounge around together, have a lovely DS.
however you focus on material things first. then mention your children, and that your wife is attractive to you.
your wife, it seems to me on first glance, is a mystery to you.
was there ever a time you felt you knew her well?
what is her greatest passion?
what is her favourite place to go, and why?
if you and the children were not in her life, what would she be doing?
i get the distinct impression that you don't know this woman at all, and probably never have. that may be because she wanted a husband from whom she could remain distant, because she has deep-seated emotional problems. OR, it could be that YOU wanted someone distant, because you didn't want to put in any emotional work, and would rather just be taken care of by a wife. Or a combination of those.
have you ever had counselling, individual counselling i mean? if not, why?