Ghost should've known better. He had been confident that his blood stash would last the week but after getting hurt, he had drained most of it.

He was getting exhausted more easily and was unable to heal properly.

You had noticed, seeing how he got more aggressive but never lashing out.

He only kept to himself, looking more paler than he already was.

You were worried, especially when he turned down the offer of getting blood straight from humans.