Heartbreaker

noun

1. Someone, usually attractive, who flirts with or otherwise enamours a person, but does not reciprocate their love.
2. Something that causes sorrow, grief or extreme disappointment.
3. A match which ends in defeat for a promising player or team.
4. 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.
5. A curl or lovelock.