Sentence:  "And this little lovely standing next to him is my favorite <WSD>heartbreaker</WSD>, The Fair Lady Sara from Samaria. Kids, this is Dr. Donovan." Sara beamed, obviously thrilled at being considered anyone&#39;s <WSD>heartbreaker</WSD>, especially Uncle Erik&#39;s. 
Meaning of the word marked with <WSD> tags:  Someone, usually attractive, who flirts with or otherwise enamours a person, but does not reciprocate their love.