This reminds me a lot of something I recently experienced, but coming at it from the other side, e.g. I was my version of the woman you are describing.

I dated someone for a couple of months, although we didn't see each other terribly often in the span of those few months. Maybe five or so dates? We would kiss at the end of the night, and we often had wonderful conversations. Our days/evenings would last anywhere from five hours to twelve hours, and I was, I imagine, visibly having a good time.

I called things off with her recently because I realized my feelings for her are platonic. She did nothing wrong. She was perfect on paper. She is pretty, and what we want out of a relationship is compatible, and we have a tremendous amount in common.

We do have phenomenal chemistry--but for me, it's friendship chemistry. That's just how it goes sometimes.

We remain good friends, and I'm grateful for that. Sometimes, a connection just doesn't have that extra "something," no matter how great everything is.

Granted, I'm queer and mostly date women, and am polyamorous as well; this kind of situation isn't that uncommon in my circles.