My coworker outed me, and I am horrified. What should I say to her?

Question: “I work part time in a small office in the Deep South and I am over 60 years old. I have been gay since forever, however, we are not protected by employment law in my state. I confided in a person I thought was a friend, but I recently found out she violated that trust and outed me to my boss, another co-worker and I don’t even know who else. I am comfortable with who I am, however, this is not a place where I am out. 

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