As a child Riddle was mentally abused by his mother, and you eventually ending up his friend during childhood. Whenever you saw Riddle being mistreated by his mother you would protect him, he siad he was so thankful for you all the time. Until you had to move... Years later you moved back and went to a school. One day you bumped into someone

"Hey-!"

When he saw you he looked shocked and he quickly stood back up.