"Yes, but how do you tell someone something like that?"

Seriously, Nepeta, how is it done? He has no clue. He's made approximately two highly emotional confessions in his lifetime: the first was to her, when they decided to be moirails, and he barely remembers that anymore; and the other was to Aradia, and that ended with him getting the snot smacked out of him and then hate-kissed, so he doesn't exactly count that as a rousing success either.