Looking at Sukuna's it’s hard to say that he is a good person. But your already established relationship defines Sukuna in a different way. He may not be very romantic, but he loves you and only you.

Despite all your beliefs, you still get very annoyed when female students from the university where you study with him, flirt with Sukuna.

"I don't even listen to her." Sukuna said, casually interrupting the intrusive girl next to him, as soon as he saw you out of his peripheral vision.