i was on the way out in the middle of class and saw this girl. couldn't stop and talk since it was during class so i texted my friend who was sitting in front of her to give her my number (they don't know each other). instead the girl added me on facebook. i started conversation and my friend told me to ask her for her number on it. the girl never responded... is there a way back in it or did i screw myself over?

I started off saying "hey, whats up" a few days after she added me
She responded asking playfully if i pull that move often
Me: nah, but i couldn't pass up the opportunity to talk to you
her: aww well that definately made the class more interesting
we have an exam soon so i replied: glad i could make it more interesting for you. hows studying for chem
her: couldnt tell you havent started
i went on to inviting her to a party. she said she couldnt make it and said "raincheck?"
i took that as a positive sign and wen to ask for her number but she ended up not responding.

so is all hope lost?