If only the strength of the love that people feel when it is reciprocated could be as intense and obsessive as the love we feel when it is not then marriages would be truly made in heaven.
Love is never lost. If not reciprocated it will flow back and soften and purify the heart.
If God created us in his own image we have more than reciprocated.
We've all had that fear that despair of losing someone or this fierce desire because it's not reciprocated. The less reciprocation there is the more desire we have.