You know that the reflecting/introspection and the world being all full of marrieds/couples, is a stage on the journey.
The world is full of couples, and at some pont one might re-join them, but there is a world of single and content people. They are just a little less obvious!
I did go through a phase os desperately wanting to be part of a couple again, but it didn't happen, and as we all know here, that no relationship is far preferable to not-a-good one.
I think when we are in a relationsihp and happy with our spouses, the world becomes a more static and settled place. Singlehood is more turbulent, and we are reliant on our own resources. It is scary but liberating. If I want a social life I have to make it happen. And it takes time and effort. Getting to know and like, and be comfortable with spending time with ourselves is time well spent, after a life with someone else. I have a couple of redently widowed friends, and apart from the betrayal [and it is a big thing] they face many of the same issues.
So we keep gong on, sometimes a bit sad, and sometimes a bit bored, but more and more, if we have any sense, doing things we like and give us pleasure with people we like . . . . as 25 years said, it beats being in most of Africa.
