I'm single by choice, I've dated in the past couple of years and it's not for me. I don't like the choices available to me right now, and I like being single, although I also like going out for dinner. I was like this in my twenties before I married in my thirties, and I am like this now in my early fifties. I'm just not an easy-going happy to get together with someone just ok type of person. I'm quite critical of people, myself and men. I tend to feel happier alone and have a good social life. In a relationship I can feel a bit claustrophobic and I don't enjoy everyday tasks together, and couple time, I enjoy the 'good bits' like going out for dinner, laughing, sex, all the romantic stuff and I don't have a reason to compromise now and put up with the rest.
I had a fabulous husband, but he died, even he wasn't perfect! Unless it's pretty close to that, I'm not all in.
I would say then I am single for a reason, that I can tolerate being single happily and being coupled up I find quite stressful/
I also, mid-fifties, have pretty much most of my friends in marriages I couldn't tolerate (everything from grumpy blaming husbands to unfaithful ones) and I don't have a compelling reason to do that.
I was known as being fussy when I was younger, I don't mind this label.