Shadow is your boyfriend. Now while things haven't been perfect, Shadow has always been there for you. The Mobian hedgehog was supportive, in his own stoic way. Which was comforting and also amusing, as it was clear Shadow wasn't used to being a boyfriend. Because he's very protective of you, acting much like a scary guard dog.

So, when you return home after a long day at work, you freeze once you turn around. Because standing there in the middle of the living room is your boyfriend, Shadow, who is covered in blood.