I was just asked a fascinating question: How do you know if you were meant to be single? Personally, I wouldn't use the phrase "meant to be," but I understand what the questioner is getting at, and I've been mulling it over ever since.
To some, concluding that you were "meant to be single" may sound like a bad thing. Not to me. I'd just change the wording - I think I'm single at heart. I love living single (except for the singlism) and never did have those reveries about some lavish wedding with the bridesmaids and the big white dress.
To be single at heart, I think, means that you see yourself as single. Your life may or may not include the occasional romantic relationship, and you may or may not live alone or want to live alone, but you don't aspire to live as part of a couple (married or otherwise) for the long term.
You can be single at heart regardless of your actual status as single or coupled. Similarly, you can be a coupled at heart regardless of whether you really are coupled at the moment.
So what are the criteria? (Continue reading here at Living Single.)