Yes, especially since they aren't polyamorous, she just decided to try it on. It's a way to have your cake and eat it too, to have an affair without feeling guilty for it.
Here's the check to see if that's true or not - did you go on group dates together? Or did you keep your side action completely away from your boyfriend?
If you all met up and it was completely open, that's a sign of true polyamory. If you kept everyone separate and would die over the idea of them meeting each other, that's having an affair.
And to be clear - AvPD is a condition that requires a genetic predisposition and a child abuse trigger. It's not some joyous alternative lifestyle to be celebrated. It's also not a choice. Screwing around, with "permission" or not, is a complete world away from AvPD. Kindly show some respect. Maybe then you'll earn some in return.