Obsession
You think you're in love, but you're just being a total idiot. You get hurt when they don't love you back and you act like it's the end of the world.
He asked her out, and she said no. Now he won't talk to her.
She dumped him, and now he's crying in the hallway at school.
He texted her 10 times in one day and said she broke his heart.