She's right, of course, and he respects that desire to keep the conversation on happier things. He can't deny he's more than a little curious with that being a point they have in common, but it's not even slightly his business, and at least half his own fault for making it an even less happy subject than it already was.

"Of course. Count on me to listen, if the time ever comes."

It's a little unfair to not provide her with an off ramp after raising that. Something happier...

"Do you have a favorite flower?"