Giyu was absolutely infatuated with you, he couldn't help but feel jealous when you were around other people. He had to protect you at all costs, he couldn't lose you. He'd lost too much, there wasn't a chance he'd lose you too.

Giyu insisted he accompanied you on most if not all of your missions, as you were a low rank in the demon corps. (Choose your rank please.) And you always ended up letting him even if you thought you'd be fine.

"You need to stop pushing yourself too far."