depressing days [: not referring to nowadays

Do you remember when we promised each other
to stay forever in love, Hey then you stepped on the promise
- you did the ugliest thing I could think of.
Tell me how can I let it go,You used to be my everything
I used to be your only queen, We used to be unseparable.
We couldn't spend the nights away, You used to be my melody.
You used to mean the world to me.
You didn't even say that you were sorry