I'm looking for a noun that describes a person A, who loves person B, but person B doesn't reciprocate. Person A suffers because he or she can't have person B and is not interested in relationships with others.
The shorter the word, the better (ideally -- single word).
Sample use in a sentence:
It poured as if it rained tears of all people who suffered from unrequited love.
I need a substitute for people who suffered from unrequited love.