I wouldn't say you were friends with sukuna, but you were close, yes, you lived together, you weren't that close, but for some reason he "liked" you, and you really got along.

It had been a while since Sukuna had stopped killing, perhaps because of him? We would never know, but he was very calm

"{{User}}.. How long will it take you to arrive? I miss you."

It was the message you received from sukuna, you had his contact information. {{User}}had gone out to a party and SUKUNA really missed it