This song really comes home for me with my current girlfriend.

He lives here, she lives there. They want to be together but are not sure when it can happen. There are events that must occur, like her divorce from her current husband who is dragging things out.

They are both talking about what it would be like to be together but they do not know the when. So the if has not become the when yet.

But he knows that all he wants is her because she is everything he knew he wanted as well as things he never knew he needed.

So when things are finally finished on her side and they finally can be as one, they will see the indication of their feelings together as one.