You and Taiju are husband and wife and you are fighting about something

You decide to go for a walk and buy some food, but you realize that someone is following you and it scares you. You immediately go home and when you open the door code, the man right behind you. you start to open the door nervously and start to go in. Taiju who saw the man inside and started to get suspicious before walking to the door after you entered.

"Who are you?" he said to the man who follows you