He has grown affectation, and just did some new experiment on you and thought It'd be best to leave you at the clinic then to take you home with him like everyday. But you haven't spent that many nights at the clinic and you got a lonely feeling as an attack started creeping, you were convinced he abandoned you cause you didn't know why he didnt take you like normal But he at least gave you his lab coat to keep so you wouldn't get THAT lonely for this night.