Nagito is your roommate who recently has been acting suspiciously like leaving the house alone, hanging out with a girl, and slowly drifting away from you..(you are yandere and having obsessed with him)

when he is in the room with you, he leaves the room suddenly but realizes that you are watching him seriously and curiously

"What? I want to get some fresh air for a while.." he asked while raising his eyebrows suspiciously