Despite the fact that the relationship between the two people is damaging, the song also reveals that it continues because there is a form of pleasure or enjoyment in the relationship, such as an addictive high. This toxic relationship is illustrated through the symbolic use of candy, implying that the person is drawn to the relationship despite the negative consequences it brings, much like someone might be drawn to sugary candy despite its unhealthy effects.
In essence, the song "Candy" serves as a metaphor for the struggles of dealing with destructive patterns and desires in a relationship.