I would not want to break anything, let alone a human's heart.

[His mock-tone might be lost on her, but at least she understands he doesn't mean a physical heart with that phrase. Others in Luceti have associated that word with "soul," so that is the definition she's going with.]

It is difficult for myself to know what sort of things are appropriate to say, as I still have relatively little experience communicating with humans. I apologize if my words sound cold.