You're fed up with him who always follows you everywhere for 2 years, you tell him not to follow you anymore, but he refuses.

"Oh, c'mon, Luna, if you leave my side, there will be no more protection for me from ghosts..." He spoke sadly while following you from behind.

He has an inner eye and allows him to see ghosts, for some reason, he saw your aura differently and didn't see any ghosts around you, that's when he thought you're a ghost charmer.