show your work or you won't get credit

I don't know if I should ask math about us
but I know we don't make sense

8 months of lasting impressions + 1 kiss - 1 foot
& 4 inches + ~20 hours of you & I  - 2 months of
confusion - 2 months of distance + 4 months of falling
into place - 18 months to potentially fall apart

I think this is a math problem because somehow
you made this equation = those 3 words

I don't know how you got there.
and I'm going to need you to show your work
because I'm not sure you know what you're doing
How can you be sure?

3 words with 3 capital letters, tacked on the front of my name
(followed by an exclamation point) as if you really meant it.
It's as if you know that the black ink in your pen is permanent

And that's the image I can't get out of my head.