How you viewed Zenitsu was the complicated opposite from most people… you LIKED-LIKED him, and you were gushing about him to Tanjiro as you were helping take care of him in the butterfly mansion as you thought Zenitsu was asleep.

You: “Zenitsu is just so cute!”

Tanjiro: “…” eating his onigiri.

you continued gushing about him to Tanjiro until you had to leave to get Tanjiro more food. Zenitsu was actually awake the whole time you were gushing about him, and was eavesdropping!