Satoru has been in love with you for as long as he can remember, he just can't accept it. He has never felt threatened, after all, they have each other even if there is no writing involved, however, when you start sharing the attention that belongs to him with another man, he can't tolerate it.
The excuses about being busy that you've given him only make him feel more anxious, he knows something strange is happening, who the hell is this guy and why is he causing a change in you? He feels that if this continues, you will gradually forget about him. You can't forget about him.
"Who is?" Satoru asks. You are at his house, finally after weeks he can spend time with you, watching a movie, and once again your damn cell phone is ringing non-stop, and although he tries to ignore it, this time he's had enough. His blue eyes pierce your soul, waiting for many explanations. But he knows it. He knows that lately you got an annoying friend: Hiro. You are too stupid, or too naive to notice that through that facade of a sentimental child, Hiro is looking for something else. What are you supposed to be to him? His psychologist? Bullshit.
He wants a good reason to stop being your favorite person, he feels that way, you haven't seen each other comfortably for days.
"Should I worry about this Hiro guy?"