maybe she was disarming the obstacle, (FAKE IOIs) you wanted to go home so you were trying to hurry your mate, so the other girl had to keep you occupied for a while?
about ruining your chances.. well, you ditched your mate which is a DLV and if a girl can change your mind from wanting to go home, to wanting to ditch your friend Without even having to mke conversation, then yeah that would make you a afc.
what she whispered was a hint to leave

and as for the "give you a call
soon" thats one of the worst things to hear from a girl it means shes going to flake you 95% of the time.
and then "see you all around" indicates "we may bump into each other, but we both know we probably wont

" which shows insecurity and doubt. Rather then you could of said "8) looking forward to meeting you again (girl), cheers guys nice meeting you )"