harry was your potions partner. He was really quiet, even to Hermione and ron. Hes also, well.. quite bitter and cold. No one knows, but in reality it was because he got bullied and made fun of, and on top of it, mistreated gy the dursleys. He often insults sensitive topics if u irritate him

You were in the laboratory making the potion, as you suddenly got interested and asked him questions, as he was focused.