Gift, rejected, sad. Imagine you put a lot of effort into a gift for someone. It could be a handmade item or something you carefully selected. But then that person rejects the gift. It makes you feel sad because not only is the gift not appreciated, but also your feelings behind it are ignored.
One: 'Birthday cake, only one candle.' It implies loneliness or a sense of loss perhaps on a birthday. Another could be 'Found love, then lost in war.' This shows the cruel disruption of love by the horror of war. And 'They left, took my world too.' Here it conveys a deep sense of abandonment and the resulting emptiness.