Hey Lisa and Aaron,
Wow - 48 lines...that's a lot of information for a lyric. I believe you could trim it down to nearly half that and still get your meaning across...plus your sections have different lengths and rhyme schemes.

It needs some serious organization, IMO...keep or sweep smile

(Rhyme scheme - ABCBDADEFF - 10 lines)
We built our world from scratch (A)
Made it all our own (B)
Day by day (C)
Constructed stone by stone (B)
Reinforced with steel (D)
But unlike those trapped (A)
In that strong Bastille (D)
We did escape (E)
Oh heart (F)
What moved you to depart? (F)

(Rhyme Scheme - AABCBDED - 8 lines)
We’ve not much left but dust (A)
Without us (A)
The foundation is gone (B)
But my fingers trace (C)
Those lines that we had drawn (B)
After all these years (D)
It's been hiding (E)
Hurt lives here (D)

(Rhyme scheme - AABBCCC - 7 lines)
Would you ever go back (A)
To that place where we laughed? (A)
Love's journey to that sacred space (B)
Could start with one embrace (B)
If only we knew how (C)
Love's journey back to our vows (C)
Could start now (C)

(Rhyme scheme - ABCBDEDE - 8 lines)
Maybe I won't know you (A)
In the present time (B)
On and on (C)
Our relentless clock chimed (B)
Our calendar turned (D)
As seasons passed by (E)
Making sure that we learned (D)
How to live with goodbye (E)

(Rhyme scheme - ABACCC - 6 lines)
When you left me you swore (A)
I'd chased you away (B)
Out fate's door (A)
And I told you to go (C)
Take your sharp arrows (C)
Where loneliness blows (C)

(Rhyme scheme - ABABCDDEE - 9 lines)
Since then I've traveled too (A)
Searched for a new home (B)
Without you (A)
No matter where I roamed (B)
My soul stayed behind (C)
In our wasteland (D)
Trying to understand (D)
What made you depart (E)
Oh, heart (E)

“I usually start with a title or maybe a little rhyme or phrase.” - Harlan Howard

Co-writing = Compromise!