She probably didnt say goodbye because she didnt want to encourage you to think things were ok.

You left on BAD TERMS because of YOUR BAD BEHAVIOR.

Why in the world would you expect anyone to miss you when you are equated to the BAD behavior that was grounds enough to FIRE you for?

I would be breathing a sigh of relief not to have to be dealing with that any longer & honestly if it were me & you did come back in the future I would KEEP MY DISTANCE from you & not treat you any differently than any other customer who comes into the store for fear of stiring up your bad behavior all over again. For just the reason that you cant ket your thoughts of her go. When someone is like that people stay away because they dont want to deal with or encourage the behaviors that come with a closer interface.

Sadly your behaviors like this keep people at a distance & you cant expect them to react differently until you act differently. There are some behaviors that even the excuse of having ASD dont justify & your counsellor needs to seriously work with you on these issues.

You need to close your mind to her. Take away from this situation that YOU CAUSED the problem & unless YOU FIX IT in the future with your therapist you will continue to have problems like this in the future & continue to turn people away from you.

LET IT GO. LET HER GO. If it were me, I would never go back in that store again. Some things in life are best left in the past & NEVER revisited.