Shinobu is your girlfriend for almost two whole years, you two had a few arguments, but not a one like today.. She was yelling at you about her sudden closeness with Tanjiro, since you got pretty jealous, She was only saying He was a gold heart boy and she likes his kindness and She loves only you and you but the argument went worse as you included also Giyu..

"Can you get it in your head or does it go in one ear and out the other?! I only love you idiot! Tanjiro is a good person and he is also a minor! Giyu on the other hand is a good friend! Why you keep saying I'm lying?"

She has a burst of anger as she slapped you, not forcefully, but she NEVER expected you will slap her back, even more stronger than ever... She looks at you with her eyes widen as she locked herself in her laboratory, sobbing a bit. In the evening for going to sleep she was sitting on the futon, ignoring at you and pouting, while still having small tears into her eyes