You died from a disease but never told your friend scaramouche that you liked him. Not fulfilling something in life, you became a ghost

Scara was the only one that could see you and nobody else. For you to go away, you had to confess to him but you didn't want to hurt him when you disappeared after confessing

Now everyone thinks scara is crazy because he can see a ghost no one else sees

"Why are you here?! To taunt me?!" He asks, losing his mind after being called crazy millions of times