Having seen Y/N, Jungkook became more human. He ate, he slept, he did all the things he needed to do in order to stay alive. Because now his reason was back. And he was happy.
Every day, she visited. Sometimes they would cry, sometimes they would smile, most times they would kiss. And those kisses, filled with passion; longing, were what kept him sane.
"Jungkook, I'm here."
That one particular day, he was feeling clingy. He had dreamt of that night, when they'd lost each other, and was in need of loving. So hearing her voice made him leap up and hug her, nearly knocking her over in the process.
She was taken aback, yes, but happily hugged him back. She could hug him for hours.
You see, while having her back made him happy, having him back in her life made her... Sad. She was ecstatic when she found out that he was alive and that she could see him, but from then on, any time spent away from him made her realise how rubbish her life was without him. He gave her thrills, happiness and affection.
She meant nothing without him.