So... Mathematica and Dancer did hook up.
The story from both sides: She fell for him. It wasn't reciprocated. She is hurt. He is baffled.
She has no (and never will have) idea that Dancer and I are friends with benefits. Girl code indicates that she made a claim to him. I remained silent. I continue to do so. He and I are friends.
All the same - it's decidedly awkward to recieve a note that both confirms and relieves the same worry.... "Did they have sex? And what does this mean for me?"
Yes. They did have sex. What it means for me is that she is hurt, and opting to not interact with him.
To analyze both of them (because I'm getting bored with my own bellybutton):
Mathematica deeply longs for a relationship, and for someone, anyone, to show an interest in her. So she pursues, elaborates, and never lets a guy have a chance to show his own interest. She says she knows how to be happy alone, but she doesn't.
Dancer wants to not be hurt, or confined by a relationship. He very much controls his words and actions to not mislead anyone he might become physically involved with. It will be friends with benefits, or it will not be. That's how he works, and protects himself. He is honest about it, I can't fault him for that. I can fault him for not recognizing infatuation in the form of bacon roses.
So there we are. Mathematica has subtracted herself from the picture, being too hurt to interact. IMO, that's a mistake. She is so uncertain of herself. I can see a part of me in her though, and so I have sympathy more than pity.
Where do things go next with Dancer? To dinner. To movies. To bed. After talking with him, I don't see a reason to change how things are at present. He will be a pleasant diversion when I can't be with Deity. And when I can be with Deity all the time... Dancer will gracefully retreat back to friend, as opposed to "Friend"
It will suffice.