During the dawn of the "rock and roll" era, Elvis Presley sang a ballad called Return to Sender. The song is a lament. He grieves that his girlfriend wrote "Return to Sender" on his love letters and handed them back to the postman. Each one of us who has ever been rejected in love can identify with Elvis' sadness as he sings the song.
But the truth is that when a person no longer wants to be with you, you are better off without that person. To try to hold onto a dead relationship only prolongs the pain. You don't need a love in your life that doesn't really want to be with you.
It stings to be spurned, to have someone tell you that he/she doesn't want you any more. But, in the long run, this kind of honesty is a gift. In this way both parties are free to lick their wounds and move on to a relationship that works better.