ummm lots of things...........time that has passed, nature or circumstances in which you extracted her digits in the first place, she may be over her minutes, not attached to her phone,
-other offers
-has a life outside of you
-cant find her phone
-phone turned off
-had a better offer
-wanted some validation from a guy
-doesnt answer unknown callers
-your text or voicemail u left was lame
-not happy with her choice at that specific time
Buyers remorse is the biggest idiocrisy on the planet............IF YOUR NOT COMPLETLY SATISFIED RETURN TO SENDER FOR COMPLETE REFUND.
Unless what you offer is totally 100% cool and economically valued, a great majority will excercise that policy. It's a viable option because competition is stiff.
When U speed seduce someone, you often skip crucial steps in building a connection, which often leads to chics flaking (non response). A counter tactic is to ensure their needs are met PRIOR to you walking away and or a great follow up banter to further establish a deeper connection.
Chics flake for all sorts of whack reasons that no man will ever truly comprehend........thats what being a girl is all about. They been this way since the adam and eve days. Some guy labled it "FICKLED" back when your grandfather was courting dames..........fast forward to 2009 and not much has changed.
U can view it as a Numbers game 2/3 women will flake and move on or CSI specifics of your extraction/seduction (tons of variables to consider) to reduce the "buyers remorse" option. I say get rid of that buyers thingy all together.