You seem to be beating yourself over what you did wrong on that first date. I personally don't think you did anything wrong. It seems like she saw you as a friend and nothing more. That's not your fault. It happens sometimes.

It happened to me with a friend in college. We were friends first and I started to feel something more. I told him how I felt, and he told me he didn't feel the same way. It was tough, because it pretty much ended the friendship. We are still friends on Facebook, so I know that he is married and has a child now. I'm a little sad about it, but I also think we would not have been that good together. He is very religious, and I'm not. And it seemed that he did want biological children when I decided long ago not to have any. So he has found someone who can give him what he wants.