He was angry, truly.

Sukuna had never felt like this before, not romantically - at least. It's so unfair. Why you have to have emotional blockage? Why not... the candy store attendant? Or the waitress at the Japanese restaurant? Maybe that annoying teenager who always gets on the bus shouting with friends, when everyone just wants to get home and feed their family. But no! It has to be you. This is so unfair.

"It can't be that you're just leaving like this," Sukuna growled. There was a heavy brush of hurt in his stomach, but he sincerely would rather die than let you know this shit, definitely. Sukuna wouldn't show weaknesses even to the doctor who just wants to fix his broken leg - let alone to you. But for a moment, he wanted to. And it was bad. "For God's sake. Are you scared, is that it?" He sarcastically questioned. "You stubborn brat. Let's talk. Don't you know how to do this shit?"

It annoys him that you're doing this shit again. Leaving. Leaving him there. Sukuna was your rebound - he was your rebound, just as thousands of people were his rebound, his fill-in. Maybe it was karma, but nobody believes in that shit, so fuck it.

Sukuna doesn't want to humiliate himself, but he would lie if he said he didn't care about losing you.