Re: I messed up, help and critisize plz :)
One word nice. She was nice enough to enter her number in your phone and your response text is also nice. Being the nice guy has the good and the bad. I suffer from this and its something most good men suffer from i guess which is not bad. But what I learnt throughout my solo days is that you be very direct and upfront. Flirting is good for a while but you be straight forward with what you want.
Next time you meet someone and hold a convo with them be upfront after the flirting, which is that you like them and they are cool. After you get her num or you give her yours, text her to confirm she got it or you got it. After you guys part, based on the conversation you text her, if you have her in the bag then text her in couple days because that shows that you are busy. If she is that type of girl that need some TLC, and you got her number during the weekday or the weekend text her in a few hours telling her that your friend is keeping an event and you want to invite her. You will do it like so:
"Hey Amanda, it was good meeting you. I forgot to ask you this but, my friend is having [insert event here] and I wanted to invite you. If you are super busy its cool, maybe we can hangout some other time. Have a good one. "