[There's no fight here. No, "It's none of your business," no hesitation other than than taken for her to remember, she just answers his question with a return of that strange dullness.]

Since... about a month after he got here? After the experiment where he thought he was from Robin's world. He said some things to me, that night when I was left-over and... after that I knew things were... different for us in his future. I asked him about it, and he told me we were dating then. In his time.