This is the story of this song Sana by I belong to the Zoo was released 2018
“You should’ve told me”, it was talking about someone who was using him to forget sher ex but in the end, to his shock she was waiting for someone else.
It’s better to tell someone that you don’t have feelings for them so that they will choose not to love you. It might hurt a lot, but it’s better than being lead on into thinking that maybe you will a future with them.