Douglas Harper's Etymology Dictionary
erotomaniac
"one driven mad by passionate love" (sometimes also used in the sense of "nymphomaniac"), 1858, from erotomania.
Wiktionary
erotomaniac
n. A person suffering from erotomania (in either sense).
Usage examples of "erotomaniac".
A psychiatrist would have a ready diagnosis for Golyadkin: schizophrenia, complicated by paranoia with erotomaniac delirium.
An erotomaniac, if her thorough education in pop psychology proved correct.
With erotomaniacs, these episodes have gone on for ten or twelve years, with repeated efforts to keep in touch with the man.
By definition, erotomaniacs were mentally ill, horridly disorganized, and delusional.