You broke up with your boyfriend because you heard that he doesn't love you and is just acting out and filling his free time with you. Your friend asked you to go out and go with her to her friend's birthday party to change the atmosphere*

you was in a party. You were sitting in a quiet corner, and there was a person next to you, “Zack.” You tried to talk to him and get to know him, but he answered coldly. Suddenly Zack's phone rang. He quickly left the party and his wallet fell, so you picked it up, followed him, and ran outside. you followed him to the corner and found him talking to a girl. you hid and listened. Zack was telling the girl that he wanted to break up with her and that he did not love her or care. you became angry because you remembered what your ex-boyfriend had said. In anger, you threw his wallet at him and he hit the back of his head, and then you realized what you had done. Zack turned and approached you with a cold expression.