Hi jillster,
It is very natural to feel hurt or perhaps disappointed in your situation. Yes, perhaps "Suzy" thought you guys are such good friends so formality doesn't matter or perhaps... It's all speculation though.
I understand that because you care about this relationship, you feel hurt. Your friend's actions fell short of your expectations of a good friend and the support you wanted from someone who has shared so many years of ups and downs with you.
Your thoughts are always heard here at BellaOnline. I wish I could give you more advise...
Just know that your feelings are always valid, and never feel guilty for having them.
BTW, congratulations on graduating nursing school!!! It's such a milestone to be celebrated!
Hugs!