Seem that, this is a common problem with many couples especially those 50s and above.
Did discuss with some senior friends and colleagues.
One of them said....." you know why so many uncles like to sit in coffee shop or hawkers centre doing nothing instead of going home......yes they still sleep on the same bed ...'"
One of my neighbours do complain about each other to me. Due to some reasons they are sick of each other. {I'm a good listener)
I won't be surprised if this happen to me too. Sadly I can feel it coming.
