What do you mean by the hammer hitting you in the head?
What I wrote, "I happen to be in a very good marriage, but staying has always been by choice, not because I NEED to be in a relationship." I meant that since my early twenties I've known I'm just fine living alone. Survived nicely socially, financially, emotionally, and was able to take care of whatever repairs or other problems cropped up. So I don't NEED to live with someone else because I can survive just fine either way.
Also, being alone doesn't make me feel lonely. That's not true for everyone.
That said, I'm glad to be in a very good, long-term marriage. But it's a preference, not a need.