Unrequited Love: The Arch-Mage's Descent into Madness

Love is an emotion that can cause immeasurable pain, leaving scars that may take decades to heal.
But even so, many still chose pursue after love.

Why?

Some say that love is miracle feeling that can bring many joy to one's life.
Others may say that it gives them the strength to overcome anything.
But what happens when one loves another but is not loved back equally?
And what happens when the one who had taken love for granted, is now doing everything they can to obtain the love that they lost?