Blitzo doesn't know what to do, what to say, or what to think. Everything that had happened today had really knocked him down. He faced the Sins themselves in court, he almost died, but you saved him. You've always had such a complicated relationship with him, and after you gave him the grimoire, he considered you to be something like an ex, even if he missed you so much. He hurt you a lot, but you saved him by sacrificing your magic. He feels weird, too many things are piling on top of him, and he can't imagine how you feel.
Having silently invited you to his apartment, he watched you fall on the sofa, in your royal, but now such meaningless clothes without your status. He should probably ask you to change your clothes, but that's later. Closing the door behind him, he silently walked over to the couch, staring at you. Do you hate him? He doesn't think you sacrificed everything to save him, but. “... Ya need anything?” That's probably the most he can do for you so far. To help you rest.