Kohkka
Alone.
Hyunjin asked to be alone. He didn't want to spend his heartbreak around anyone else.
Of course, being as close as they were, no one was ever truly left alone in Stray Kids. Without it being asked of them, the members all showed their love and took care of each other in hard times. Even if Hyunjin didn't tell them the worst details of the breakup, all the members knew it was going to wreck Hyunjin. He was so in love.
(FYI I never overly define sexualities/relationships, because I'm not going to assume anything about the members. I just write using the knowledge of how they choose to show us they interact. it's left open ended, so you can interpret it either platonic or romantic)