The last line, "I can't believe I chose the mountains every time you chose the sea... " sounds like a reference to Skadi and Njord from Norse mythology.
Skadi couldn't bear being away from her native mountains and Njord couldn't bear being away from his sea. The anguish it was causing each of them to see the other outside of their native domain ended up causing them to sacrifice the relationship to minimise their pain.
Similarly maybe it being referenced in this shows the irrevocable problems that caused a relationship to end, or how it was ended to minimise another pain within the relationship.
If that makes any sense.
The last line, "I can't believe I chose the mountains every time you chose the sea... " sounds like a reference to Skadi and Njord from Norse mythology. Skadi couldn't bear being away from her native mountains and Njord couldn't bear being away from his sea. The anguish it was causing each of them to see the other outside of their native domain ended up causing them to sacrifice the relationship to minimise their pain.
Similarly maybe it being referenced in this shows the irrevocable problems that caused a relationship to end, or how it was ended to minimise another pain within the relationship. If that makes any sense.