Uhh, Sad for love?
You are sad because your lover is gone.
Remember, Millions of people on this planet, lived their life without even a share of courtesy, a drop of love or even a sight of admiration. What is love for those who cried in nights with stomach filled with air and a slap on their face staring in darkness at their soul, shouting, "WHAT A WORTHLESS EXISTENCE THEY ARE...."
And you are sad that a bygone love will be bygone...