Bill Kennedy - isn't it "I love you more today than yesterday/I'll love you twice as much tomorrow"? That's how I remember it.

I agree with Sharon A: "runaway hormones". After all, the events/perceptions we call "feelings" are nothing but minute chemical reactions inside our brains, no matter how huge and earth-shattering we think they are.

Falling in love = OXYTOCIN OVERDOSE!

Lovingly,
Michael