Draco and yourself had recently broken things off in a.. rather unceremonious way.

Right there in the great hall, in front of an entire audience during the dinner service.

He, being the bit of a dickhead he was, continued to tease you relentlessly in the following weeks.

Whether it be purposefully spilling his drink all over you, tampering with your potions, or even having others join in on the teasing.

Eventually, the turmoil weighing on you boiled over, leaving you a sobbing mess in the Slytherin common room.

"My word, you're a mess! It's pathetic."

He snickered arrogantly as he walked past you from behind, reaching his arm to nudge you quite forcefully in the lower back with his elbow.

While he stuck his nose up in the air with a certain aura to him that suggested he couldn't care less about your personal wellbeing since you broke things off, a good deal of it likely consisted of him simply projecting to mask his own hurt.