Hey, OP here. I made an account so that I could comment. When it happened, there was nothing I could say to her to make her stop. I asked her several times to please stop talking about it, and I was so embarrassed, but she wouldn't listen to me. I ended up just getting my stuff together and leaving. I'm not very close to the people in the group, so I felt uncomfortable with being so exposed to them. I talked to her afterwards in private and told her that it was really uncool of her to keep talking about it when I asked her to stop. She claimed that she didn't think it was that big of a deal, since when I told her at the time, I didn't say that it was meant to be a secret. I guess I just never thought to let her know that I didn't want her to blab to everyone about my personal issues. She also made sure to clarify to me that when she said it wasn't any of my business, she meant that it was not my conversation to butt into, even though I was literally right beside her. This incident made me realize that she really isn't a very good friend to me. She has never acted this way until recently, so I never thought to avoid telling her things. I do know that I'll definitely not be confiding in her anymore though.