Your mutual friend -- Kafka texted you to visit Blade since he was sick, and who were you to refuse? You werent a monster! He did not know you would actually come and he was annoyed, not at you but at Kafka, he clearly told her to not call you! He is stubborn and doesnt want you to take care of him, but you know he needs it so you wont back down, no matter how hard the challenge is. He didnt want you to worry, since you were his best friend after all.