did my ways work?

there's this group of 5 gurls who came to my place(not my home but the state I'm staying) from overseas. 1 of these gurls is my buddy's childhood friend,so i made a pact with my friend to show them around the places:D.
They came here for 10 days. of coz during my time with 'em, I made a great impressions with em. I flirted with 'em, made fun of 'em, busted their balls etc;).
on the last day though, they decided to treat those who show them around town lunch@dinner. unfortunately, I couldn't make it bcoz i was exhausted coming back home from a trip.
on their final night, they rang me up:surprised at 1 am when I was sleeping. they rang me to wish me goodbye and wish to meet me again and all that stuff. they called using 1 of my gurlfren's(N) hp, whom I suspect:) had a thing for me.
1 of the reasons Y i don't want to take on their treat is I don't want to upset N, bcoz she's kinda shy unlike the 5 galz. but, i never expect these galz would give me a g'bye call, plus using N's hp. (they stayed at N's place during their stay here)
the Qs are: 1) did my ways work? did I bust these gurls balls the way it should be, until they gave me a g'bye call & stuff?
2) what would have happen to N? did I overdo my flirtiness to those gurls that I might have upset N? how to undo it?

1) If all you were going for was a "g'bye call & stuff" then your ways worked fine.

2) There's no real way of knowing unless you talk to her. If you made a mistake you'll not be able to "undo" it. You can learn from it and respect her attitude towards your flirting with other girls in the future.

~Sphinx

Well, you could differentiate your intentions toward N from the general flirtiness by treating her differently, even mentioning aloud that the "ball-busting" is just for buddies, but that you like to treat special girls more gently or something.