A home is a home only if you treat it like one. Otherwise, it is just another place to sleep, shower, and eat.

Similarly, family is family only if you start treating them like one. Otherwise, the spouse is just another roommate that you dine with every day. Children are just little human beings that you have to feed and bathe.
A Hi or Bye is hard to come by. What more, with stories of everyday life.
After some time, everyone is just tired of making an effort.
Hence, amicable separation and co-parenting would probably be the best way to go.