You are not delusional. You are holding a grand and silent mourning ceremony for "him" who never really existed but really lived in your inner world. This kind of pain is called "ghost grief."
Psycho girl x ghost doctor
Yu Yuan, you are not mentally ill. You are using all your body and mind to carry out a heavy, solemn and incomprehensible mourning for a beloved that only belongs to the history of your soul.
Concept: Human self-healing ability is infinitely powerful