Her heart was so cold, eyes specked of gold, and she was the girl I loved…

Once upon a time, I used to love poetry. Well, I still do, and I will, tommorrow, the next day and forever.
I used to love this girl too. Her eyes were cold, but was specked of gold. Well, I still do; love her I mean, and I will, tomorrow, the next day and forever.
I used to have this best friend too. He was the epitome of perfection, the sunshine on morning dew. I still have him, and will tomorrow, the day after and forever.

Then why everything 'used to' be that way?

Because things changed, once upon a time, everything changed.