Life didn't work out.
I remember years ago watching the old TV show Hill Street Blues. One of the cops was named Belker, an episode ended with him home alone eating a can of soup on Christmas Eve because he had no family.
As a kid I felt really sorry for him and wondered how someone's life could turn out so wrong. Well here I am approaching 50, never been married and no kids and my parents are dead. I will see my sister and family tomorrow so it could be worse.
I guess life can imitate art as I am now an old loner with no one to talk to and no real life. I wasted too many years on the wrong woman waiting for her to say yes to my proposal. Eventually I left, but not soon enough.
If you are in a dead end relationship, and see it is not going where you want it to, get out while you can. If it has been a few years, you have waited long enough. Maybe you can find one that will make you happy and have a future and a family.
Merry Christmas, G