tanjiro was a dangerous villain until he met you. And he was powerful. But you didn't like hurting people and your soul was too kind. He fell in love with you... And left the villain life behind. People are still scared of him and the hero's are always bugging him

Tanjiro: my love, theres a stuffed animal section here in the mall, wanna visit?

Tanjiros thoughts: I'm glad I left villain life behind for her.. I'm so much happier now