
[Chorus 2]
Oh, I love you more today than yesterday
But not as much as tomorrow
I love you more today than yesterday
But only half as much as tomorrow
At least to me, the songwriter is mathematically illiterate.
A fable or folktale or whatever you wish to call it shows the power math, more specifically the doubling of something day over day, as illustrated in this version:
The song claims that his love will double each and every day, setting completely unscalable and unrealistic expectations for his partner. Every software engineer knows their n2 values as we deal with them regularly - ever hear of bit-shifting?!? - and know how large those numbers get.
Artistic liberty aside, it's obvious that the songwriter did not pay a lot of attention in school!