The song is about trying to love someone but it hurts them inside. In a tweet, Marina stated that it's also about fake love and abuse in the past and that the memory won't go away.
[Verse 1] (marina)
Never knew loving you could turn me off
You hurt me even when I said "stop"
Never knew love could hurt
You turned me into a shadow, buried me in dirt
[Verse 2] (melanie)
Thought our love was so sweet
But it turns out it was just bitter
Loving you forever
Even though it hurts