Analysis of I Should O' Known

Were I wise I should o' known
To steer a leery course;
And felt the tumult wind had blown
Its tempest of remorse.
But I was given to the sound
That echoed through my head
And tumbled in there, round and round,
The first sweet words she'd said.

She told me all the world was ours
Until our days may end;
Boundless love that never sours
Nor can the years amend.
She said she ever would be true
And by my side she'd stay
But now her words are scant and few ~
My love has went away.

So, as I drift into the night
And darkness takes its place
My hindsight wishes that I might
Have pondered  (just in case).
I should o' known, oh! were I wise,
With sense that could not see
Wisdom visits in disguise
But seldom visits me.