We were two quantities, behaving opposite in nature,
Like pressure and volume, inversely proportional.
We compress and expand at constant temperature—
I expand further, you compress closer; inversely proportional.

You are the R in the Ideal Gas Law's equation,
My constant, my ever-faithful solution.
Yet we aren't truly the ideal gas it seeks to ponder,
For we attract rather than repel one another.

You were the 0.0821,
The constant in PV = nRT.
Increasing in my mind, you remain the only one—
Steadfast in my heart, you will always be loved by me.