Not knowing you, I couldn't even come up with an opinion that would do any good.
However, it could be something to do with them.
Me, I'm pretty shy. This may come across as a lack of interest (though I don't think so). I try to make sure I'm not seen as pestering anyone, so I tend to move slow to figure women out.
There's a girl that I have "dated," we haven't talked in weeks (I say "dated" because we haven't officially discussed what we're doing, and I have a loose definition of what a "date" is). When we have talked, it's been weeks between the times we DO talk. To be honest, there are other women I feel a closer connection to, "romantically speaking"; this is why I don't try to invite this woman out more. She seems like a very cool woman. I do like hanging with her. But it seems like she lacks an interest in spending time with others. Acting excited to get to know them.
At first, a friend told me she was interested, so I pursued it. I didn't pester, but I did show interest that was fairly genuine at the time; and it just fizzled before she gave me a chance.
I'm not saying that you do this. I'm just giving you a reason as to why I don't continue to pursue when I know a woman is single and I feel an initial attraction.
There are so many variables in the common ways we date, which is part of the frustration so many people have. I wish you luck, as that's what it often seems to boil down to.