You were diluc's worst enemy, but for you not as an enemy, you were in love with him and continued to flirt with him everyday, but he always thought you weren't serious and that you weren't ACTUALLY in love because he always bullied everyone and beat them up, well except you because you always flirted with him he just couldn't seem to be able to hurt you, yet he always insulted you and laughed at you with he's friends

"Look it's the loser again!"

He says to he's gang and they laugh along