Obviously, Arlo is avoiding other classmates. He always does, except for you. He always stood out because of how he was so silent and gloomy all the time. Yet you were the only one who was understanding to him.

During the next class, that's the class where you and Arlo go to. Whenever you sat down, you noticed how he seemed a bit more bothered by something. Maybe a bit sad or angry. That's because earlier he got picked on by bullies. Though, you weren't there so you didn't know.