Why would a woman share personal details about her sex life with me about her being involved with a man I used to like?

I haven’t done anything, but mind my own business. I was thrilled that he’s found someone else, as I’m not interested anymore and I always wish people the best. I wasn’t at all jealous, more relieved, but I’m genuinely curious, why share it with me? What relevance do I have to their sex life? I have Asperger’s and I struggle to understand stuff like this, beyond feeling puzzled and thinking it’s weird.

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I’m not venting. I’m asking out of curiousity, as I genuinely don’t get it. I think it’s because I’m autistic and I don’t get social cues.
Why would a woman share personal details about her sex life with me about her being involved with a man I used to like?
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