Alastor just shut his mouth. There wasn't anything he could say. He wasn't sure what he wanted to say. This wasn't exactly the sort of thing one said 'congratulations' for, or any other sort of happy platitude he was lousy with in any case.
Nor was it the sort of revelation he was at all prepared to respond to in the first place. How did one react when their best friend since childhood, whose death one had never quite gotten over, came back to life and then told you she thought she might be in love with you? Especially when you knew you weren't the right man to give her what she wanted if that was truly how she felt? Or to be with her at all when she was a free spirit and you were...not?
And that was all after other considerations he wasn't able to contemplate just then, such as if all this meant she was in love with him, what did it mean about him, had been settled.
Good Lord, he truly was horrible with these emotional things.
"You're not putting anything on me," he said finally. "We've always shared everything, right? So, we'll figure out what this means and deal with it as we have to." Very logical. In thought, if not practice.