IPA: /ˌɛrəˈtoʊməˌniæk/
KK: /ˌɛrəˈtoʊməˌniæk/
A person who has a belief that someone is in love with them, often without any real evidence.
The erotomaniac was convinced that the celebrity was secretly in love with her.
Erotomaniac → It is formed from "eroto-" (from Greek "erōs", meaning love or desire) and "-maniac" (from Greek "mania", meaning madness or obsession). The word describes a person who has an obsessive love or desire for someone.
Think of 'erōs' meaning love and 'mania' meaning obsession — an erotomaniac is someone who has an obsessive love.