What does Adele mean by "bitterness" in the lyrics below?
When will I see you again?
You left with no goodbye, not a single word was said,
No final kiss to seal any sins,
I had no idea of the state we were in
I know I have a fickle heart and bitterness,
And a wandering eye, and a heaviness in my head
But don't you remember?
Don't you remember?
The reason you loved me before,
Baby, please remember me once more