The "not what it isn't for"

What is it that put us here?
That urges us thereon to stay;
Eros plunged in our throats,
Thoughts of loved ones a past away.

Distance now can only hold
That warm embrace at time's breadth;
But hold close the thoughts of those
That wishn't there was that length.

And think about what isn't there—
They're right where they are.

Marriage tolds, and tells, and wills
A special bond that keeps ones' near,
Being the warmth that beats,
And that's why...
We keep—