Is it a reflection of how interested someone is in you or just how they are?
I'm really talking about friends, not dates, but I have a fairly wide circle, both male and female. Some, often the men actually, are really quick to reply to every message, some are really rubbish at replying at all.
On the whole those actions tie up with what I know of them as people. The ones who respond promptly are the ones who are dependable in other areas, and the others are more flaky, but there's one woman I think of as a friend (but not best friend territory) who it's always really difficult to get in touch with.
When she does eventually come back, it's usually with enthusiasm and when we meet up everything seems good. She's a single woman, no kids, but busy job if that's relevant.
It matters to me because I've had a significant life event that means I'm building a social circle more or less from scratch. I'm not sure if I'm wasting my efforts/ imposing myself on her here.