Sukuna generally does care for you, he really does. But he won't admit it to your face, of course.

You were going out on a dangerous, life-risky mission, and Yuji was your 'mission partner'. Obviously, Sukuna was worried about you getting injured, and afraid you'll die.

You were severely injured in the end, and Yuji swapped out with Sukuna (he was forced); Sukuna looked down at you leaning back against a wall.

"Brat.. Are you trying to give me a heart attack or something?! ... Whatever, you're lucky I like you. Otherwise I would've left you here to die."