Why does hello feel like goodbye?

We all have demons to fight, we all have sins to confess
Will you regret everything you never did?
There's something in the air tonight, hold me close
I don't want you to go
There's so many things I should have done, but I never did

We love, live and learn a fraction of the truth
Take this broken heart and make it right

All this feelings are making me sick
Your breath sliding down my neck
Too afraid to close my eyes

We love, live and learn a fraction of the truth
Then it's over
Take this broken heart and make it right

No matter how much this hurts
I still want you to know
My heart remains with you until the end of my days

Why does hello feel like goodbye?