HEARTBREAKER

heartbreaker

(noun) a narrow defeat or a defeat at the last minute

heartbreaker

(noun) a charming person who is irresponsible in emotional relationships

Source: WordNet® 3.1

Etymology

Noun

heartbreaker (plural heartbreakers)

Someone, usually attractive, who flirts with or otherwise enamours a person, but does not reciprocate their love.

Something that causes sorrow, grief or extreme disappointment.

(sports) A match which ends in defeat for a promising player or team.

(role-playing games) An independent role-playing game that attempts to fix various perceived design flaws in an established RPG, but whose few innovations will not reach a wide audience due to its lack of marketability.

(dated) A curl or lovelock.

Source: Wiktionary