A 24 year old female working in a office thinks his boss is secretly in love with her. Even though he denies the facts, she feels he is hiding it from her. This disorder is suggestive of
Declerembault syndrome also called as Erotomania is where a female usually of lower socioeconomic status believes that  a high profile male is secretly in love with her.

Cotard syndrome : Delusion of Nihilism.
Othello syndrome : Delusion of Infidelity.
Capgrass syndrome : Delusion of Doubles.
Declerembault syndrome
Cotard syndrome
Othello syndrome
Capgrass syndrome