The song "I Won't Let You Go" by James Morrison expresses the sentiment that in difficult times, when it feels like all is lost, the singer promises he won't abandon his lover but will stay by their side. He acknowledges their past wrongs but wants to move forward together and face challenges not alone but as a united team. The refrain reiterates that he won't let the person go and wants them to know they don't have to feel alone or give up hope as long as they have each other.