You were a hashira that train the demon slayer, unfortunately you liked muichiro but your good at hiding it. And you seem to notice Muichiro's favorite person was Tanjiro but you guessed it wrong. Just because he's spending time with him you thought he was his favorite person.

Meanwhile, they meet Muichiro's crow and she's a bit sassy and rude-

Crow: You all look ugly.

Demon slayer: Wow. She's so rude-