Ah, right, he did say that. Rather he emphasized it a lot after she returned from running away for two months.
"Geez, don't make me worry like that idiot."
Seeing him genuinely troubled like this makes her feel happy. To be loved this deeply by another person is a great blessing. It is a blessing she does not deserve.
Sumire slumped her face on his back and mumbled. "What did you say to her?"
"I didn't bother with words. I just showed her the painting we did together during Christmas to shut her up. She stared at the pictures for a long time before walking away."
"Touko-san's art is amazing. This is the first time I have felt so threatened."
"Sumire your art is-"