I've made this mistake before. I came to the forums with a relationship question and ignored their advice. I just wanted to hear someone else say what I was thinking, but my thinking was wrong.
If you come here and, after three pages of everyone agreeing on what you should do, you don't take the advice and put things into motion, we're going to have to assume that you don't actually like this girl, don't want anything between the two of you to happen, and you just want 15 minutes (or three days) of attention on the forums.
We're all friends here. Friends don't let friends not go see a movie with a girl that has previously asked him out.