I think this song is about a very close to break-up relationship.
The first verse describes the relationship when it's still together, "When you go please don’t leave your love in the sun."
She then goes onto say that she is trying to fix their relationship without help from her boyfriend, "Now I'm facing this on my own."
"I can feel the fear," they are both worried about the future of their relationship.
The final verse sees her repeating, "we survived nuclear seasons," suggesting that they were able to mend their relationship in the end.
"Nuclear seasons," refers to the period in their relationship which is very unstable.
I think this song is about a very close to break-up relationship.
The first verse describes the relationship when it's still together, "When you go please don’t leave your love in the sun." She then goes onto say that she is trying to fix their relationship without help from her boyfriend, "Now I'm facing this on my own." "I can feel the fear," they are both worried about the future of their relationship. The final verse sees her repeating, "we survived nuclear seasons," suggesting that they were able to mend their relationship in the end.
"Nuclear seasons," refers to the period in their relationship which is very unstable.