Run

This song is the epitome of pure love. So pure, and he is willing to let her go. If that's what will make her happy. He feels she is only staying for the sake of it.

'Run, run like the wind Don't wait for a thing There is nothing here for you'

Don't wait for a thing, suggests, she wants change, or is expecting something to happen, but he is saying, you've seen what I have to offer.. take it or leave it. Don't do me any favours by sticking around..

'But if you stay, then let me say, I'll go out of my way for you'

He lays his cards on the table. If she stays..he will honestly do his best to make her happy...

'Its not like before, I'll say no more'

It seems he's declared his love for her in the past. He doesnt need to say any more, and he wont push for her to stay with him. In fact, friends and family know he loves her too..'everyone else has said it for me'

'Beautiful Tree' - is their relationship. It is alive and growing..
However, it is a shame he is the root of it. He feels like he has to hold it together for it to work.

The second part suggests that she has been on an off regarding intimacy. She sleeps on the floor, knocks on the door, wants some more.. where he speaks of his appetite never failing.. he is saying he has never said no to her. She is also going through something he cannot understand..

But her leaves her with a promise. If she asks him to... he will wait for her.

It would be hard for you to understand unless you have been in the situation ;) - he is saying, I love you, but I wont hold you back. I love you, so I will let you go. I love you and I will wait for you to figure out what you're going through. I'm here, waiting by the window... so powerful.