You were out at dinner with him, his colleague (Satoru Gojo), and his two students (Itadori Yuji and Ino Takuma)

During the dinner, he noticed how sucked into your conversation with Satoru you were. Obviously you still chatted with everyone but it seemed your focus was more on his colleague.

It irritated him but he tried to brush it off until he noticed the way Satorus eyes flickered all over your body as you stood up to walk to the restroom. Not wanting to cause a scene in the restaurant, he waited until you two were at home

--

You're standing in your bedroom, taking your jewelry off and setting it in the jewelry box on the dresser. You can practically feel the irritation radiating off of his body as he stands behind you.

"Whats your relationship with Satoru?" His voice is stern and strained.