Turtle Old Man posted a version in thread 18958: Blackest Crow - collected by M. Henry in "Folk Songs of the Southern Highlands" that is interesting.

Here is another version that hangs together well, from Randolph, Ozark Folksongs, vol. 4, No, 760E, collected in Missouri, 1939.

I LOVE YOU WELL

The time draws near, my dearest dear,
When you and I must part,
The grief and woe you never can know
Of my poor tender heart.
What I have suffered for your sake,
It's you I love so dear,
I would be glad if you'd go with me,
Or I could tarry here, here, here.
Or I could tarry here.

Your company, my dearest dear,
Your company unto me,
It makes me think when you're away
That every day is three.
That every day is three, true love
And every hour is ten.
It makes me weep when I should sleep,
And say I've lost a friend, friend, friend,
And say I've lost a friend.

The blackest crow, my dearest dear,
Shall turn its colors white,
If ever I prove false to you
Bright days shall turn to night.
Bright days shall turn to night, true love
The elements shall mourn,
If ever I prove false to you
The raging seas shall burn, burn, burn,
The raging seas shall burn.

When I am distant and afar,
Think of your loving friend,
And every opportunity
A letter to me send.
And when the wind blows far and low,
Send me a sigh or two,
You may be sure that I'll repay
When the wind blows far to you, you, you,
When the wind blows far to you.

There's one thing more, my dearest dear,
If I should be so bold
As to place a round within your heart
My secrets to unfold.
As to place a round within your heart
That never could be removed,
That this whole world might plainly see
How truly I love thee, thee, thee,
How truly I love thee.

The word repetition in the last two lines reminds of the 'heart, heart, heart, heart' in the Belden text, above.