relationship people

When it comes to our innate characteristics, are there "relationship people" and "non-relationship people"?

Glamour's Single-ish blog asks that question here, wondering if certain people are programmed to crave relationships, while others are programmed to crave alone time.

Some daters claim they have no interest in being in a committed partnership.

Outsiders usually respond with a conciliatory, "Oh, you just haven't met the right person yet."

But I wonder if it's really that easy.

Is "I'm not a relationship person" always an alterable state?