She thinks she's scored some points against the man's wife (who, whatever other qualities she has, is at least married, unlike the author), and against other women in competition for the same pool of men. Her description of the man suggests that she's flattered he chose her over other available women. She's bragging.
Shows what I know about the mindset, I guess. I don't even know why it's considered superior to be married ("she... is at least married, unlike the author", from your post). It doesn't sound to me like the author wants to be married - she prefers Mr. Right Now to Mr. Right. :)