Hey KRST, welcome.
I think that sometimes you can tell that you like the other person but when you start to know him better you can tell there's no chemistry... I think that's what happened with this girl. She's just not that into you.
One time I met a guy that I like but he was a terrible kisser and I couldn't stand that. He was great but his kisses were so bad, I could tell there was no chemistry and I decided I wasn't interested enough to go out with him again...