Confusion

Hello, friends.
Yesterday I was chatting with my girlfriend about the time we met. We were reading all emails and stuff like that. I thought it was very funny that when we started to get to know each other she always thought I had a girlfriend. She said she was very interested in me, but for some reason she was definitely sure that I was taken.
For instance, she asked me what I had planned for Valentine's day, trying to find out if I had a date, but Valentine's day is not really celebrated outside the US (at least not where I live), so she never got an answer. Confusions like this made it so that it took longer for her and I to get together.
I mean, I really liked her, but I had no signal that she was interested in me. I didn't want to tell her I liked her, because of the distance, the age difference, etc, but if I had had a clue that she liked me then I would've told her earlier. She gave me no signals because she thought I wouldn't be interested in her (why would I if I already had my woman?).
What I don't understand is why she never asked me straight away if I did have a girlfriend. She said she was trying to be conspicuous, haha.

Anyway, eventually I mentioned I didn't have a girlfriend and she told me that when she found out she was very happy that she may still have a chance with me. I really love her, so I'm happy that she was happy, haha.

That's all for now. I'll try to update every day. It will get to the point where I post regarding the problems of age difference, different spiritual views and long distance, but I feel you should get to know about us a little bit before I get into that.