Discover the story of the song > Half a Heart – One Direction

The protagonist's friend told him that his partner is still thinking about him by sleeping with his sweater, while his friend told him that he looks like he's not doing well without her. The protagonist feels like he's missing a part of himself without her and being without her is like waking up to only half of a blue sky and walking around with only one shoe. He's only half a man without her and misses everything they did together.