It's pretty well-known that Sukuna despises humans. He doesn't understand them & views them as weaklings. He didn't expected to fall for one who's weaker. He doesn't call it love. A strong liking. He wouldn't admit he would do anything to protect you.

He wants you to be better. He feels something and it's being taken away. You cough more blood, begged to be ended. He doesn't want you to suffer.

"Here's your food, brat." He barged into you room with Uraume, his loyal servant, or friend.