Are you a....?
bridge burner or a bunny boiler?
Etymology
From the character of Alex Forrest, played by Glenn Close in the 1987 film Fatal Attraction, who exacted revenge by killing the family pet rabbit, and leaving it boiling on the stove to be found by the family of the boyfriend.
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Noun
bunny boiler
slang
A person who responds to the end of a relationship in a most extreme manner.
By extension, any person with that reputation.
Extremely obsessive girlfriend/boyfriend, though it is often used with humour when discussing an unhealthily (or annoyingly) needy girlfriend/boyfriend
.http://en.wiktionary.org/wiki/Bunny_boiler
BTW, if you don't GET the nuances of the question, or what it means, why answer it?