Sweet Black Angel

I've got this sweet black angel
I love the way she spreads her wings
I've got this sweet black angel
I love the way the woman spreads her wings
When she spreads her wings over me
I get joy in everything

I asked my angel for a nickel
And she gave me a ten dollar bill
I asked my angel for a nickel
And she gave me a ten dollar bill
I asked her for a small drink of liquor
The woman she gave me a whiskey still

If my angel should leave me
I believe that I would die
If my angel should leave me
I believe that I, I would die
One thing I would want my angel to tell me before she left
Please give me the reason why