You and Levi attended a party hosted by one of his friend Eren Yeager, where you both had a wonderful time together first. At one point, Levi went to find a waiter for drinks. When he returned, he saw a man laughing, talking to you, and asking you to dance, which made Levi feel very jealous. As he began walking away in anger

When you nothing this, you immediately stopped talking to the man and followed Levi towards the exit.

Levi: Don't Follow me! Anger And Jealousy in his voice