Laugh it off.
I worked with a partner a lot two summers ago and we were on a good first name basis when I left for the summer. I returned this September, and my office is right across from his. Not a word. Not even a smile in my direction. Nothing. I thought, okay, so it's different when recruiting versus when actually working?
Turned out he had no idea it was me, didn't recognize me.
What can you do? Laugh. It's kinda funny, no? As now he knows who I am he is friendly, says hi, how are you, etc.
As for your BF... hrm. You are the same person, you just have a functional bite. Really, he needs to get over himself and stop projecting on you. You made a choice for yourself, not for other's reactions, so don't worry about it - they will get over it, if you did, since you are the one who actually had surgery
