I got posted anonymously to the AWDTSG group in my area. I think I know who did it. What should I do?

Someone informed my that I got posted to the “Are We Dating the Same Guy” group in my area. I believe I know who did it. In February of last year, I was in a friends with benefits relationship with a girl and she wanted more. Once I expressed that I have no interest in a relationship with her, she ghosted and blocked me. She has been avoiding me like the plague and we haven’t spoken since.

A friend told me that I’d been posted to the AWDTSG group with the caption “☕️ or 🚩”. So far, I’ve only gotten two comments and they were nice. However, I feel enraged that someone would do this. I have a gut feeling that it was her that did this although I don’t have proof. Can I take legal action? Can I confront her?
I got posted anonymously to the AWDTSG group in my area. I think I know who did it. What should I do?
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