Work problem?

A few months back I had to take a month's leave from work because of a tragedy that struck my family. I made my supervisor promise not to tell anyone about it. And she agreed. Last week, I found out from my office mates that my team leader mentioned it to them. I was so hurt for the betrayal of my supervisor and team leader that I decided to put in my notice. I have reported the incident to personnel and I'm still so hurt and angry I want to know if I can file a case against these two. Is there case for breach of confidence in the work place?