The song is about an intense, emotional relationship between two people.
The line 'Give me your hand, I'll build you a castle of sand' symbolizes the willingness to create something great for the other, even if it's ephemeral.
It reflects vulnerability, uncertainty, and the changes that love can bring.
The words 'We pour wine on our scars' can be interpreted as a metaphor for sharing pain and past.
Overall, the song sensitively describes the highs and lows of a relationship, as well as the willingness to give everything for the other.