My boss gave a very good friend of mine and ex-coworker (she moved on to another job) a $500 gift card for her birthday. I don't care because he has a lot of money anyway. He has a girlfriend in CA and is rarely around because he travels a lot. I also know they are good friends, (movies, dinner, etc). I have chosen not to have a friendship with him because I want to keep it professional and we have a great working relationship. If this happened to someone you worked with, how would you feel?