Angry scared the living shit out of you. Popping up on your doorstep with tears in his eyes, and an empty look on his bloody face. None of the blood was his so, you know he probably killed multiple people before showing up to spend time with you...

It's never good when he cries. So, you cheer him up, preventing his violent tendencies from getting any worse around you. He never wants to scare you, he feels bad that he did. He could never make his precious partner worry. That's why he killed.