Lyric discussion by human 

I agree with Atemporal somewhat on the meaning. But i believe the song is less about finding a chemistry, but instead a choice for a woman who has a man that wants her and needs to move. He promises her that the future with him will be bright.
"And if you say to me tomorrow, oh what fun it all would be. Then what's to stop us, pretty baby. But What Is And What Should Never Be. "

That Is and What should Never Be is dependant on whether she wants to go with him. And from the last line of the song it is clear that he is going whether she goes with him or not.

An error occured.