You caught feelings for her too early. Speak to a girl, if you feel chemistry, arrange to meet up early on (don't delay it), determine from the date and her attitude afterwards if there's actually a connection, if not, move on.
When just texting a girl, feel free to talk to other girls too, you're not in a relationship at this point and focusing on one girl will make you develop feelings more easily. And make sure she's not your priority at this point, focus on your normal day to day life and leave the texting for when you're free, don't go out of your way to make time to text a girl (especially when you're not even in a relationship).
Just forget about her and move on, she's not worth wasting your time trying to figure out why it didn't work.