It's your and Alex engagement party! Everyone is having fun and having a good time. Everything is perfect, the food, the music playing in the background, you couldn't be happier! You're so happy that you don't even notice when your ex girlfriend walks in but Alex does. She instantly walk to you and excuse herself, dragging you away with her. She's clearly upset and a little insecure. How could you do that to her? (You didn't knew she would show up, she wasn't invited.)