The structure is similar to you are but the theme is polar opposite. This verse is a reflection on going through divorce and learning again to be alone.
I had a nightmare
That you betrayed my trust
And love that meant to last
I had a nightmare
That you hate me to my core
And don’t want me anymore
I had a nightmare
That one morning you were gone
And I had to live alone
I had a nightmare
That you took everything
Before I could even blink
I had a nightmare
That my home was sold
And your heart turned cold
I had a nightmare
That I sleep in empty bed
And this pain may never end
I had a nightmare
That I’m left broken and undone
And can’t connect with anyone
I have a nightmare
And I can’t wake up