Sure, I'll give you my opinion, but it's my personal point of view, maybe some other people may have different opinions.
To me, this is a song in which he tells to a girl who he's in love with, how he feels about her. He feels so excited and happy but at the same time he's a little shame, so that's why he says "when nobody looks at me", and then he jumps in joy and feels like he's flying and spinning a thousand times, because of all the grace he's being filled with. When he says "sometimes I'm yours and sometimes I belong to the wind", maybe he's saying that his love belongs to his girl, but actually he's a boy or man who likes to look at other girls. That's one way of understanding it. But it could also mean that sometimes all of his attention is put on her, and sometimes he doesn't mind anything because she doesn't pay attention to him at all.
Next in the lyrics we can see the same idea expressed in different ways, for examples when he says "sometimes I'm yours, sometimes anybody's", that could be because sometimes he puts all of his energy in loving her, and sometimes he likes to lockup inside his own mind and feelings. It's like a "hidden love" or passion he feels.
He also says something about feeling sorry for not to give her all of his live, but only a few moments of it. That could be because they only enjoy shorts periods of extreme passion and then they separate again.
He also recognizes not all of their acts can be understood by each other "there are things which are very your own which I don't understand
and there are things so mine but it's just I don't see them", he accepts that certain points in their personalities may not be fully compatible, but that's not an obstacle for their love. He also talks about "naked" feelings, which means very pure and strong feelings "I can be or not to be" reminding Shakespeare's famous phrase, it could also mean at this point he can be himself or act like someone else when nobody looks at him, because nobody's there to judge, or criticize him.
When he says the skin doesn't restrict him could mean two of these: wheter he feels so full of grace that he feels bigger than his own body, or they are so happy together that they fuse or melt in an only same human being.
And when he says he sometimes belongs to her and sometimes to the wind and sometimes to the wind, I think he feels the wind is like vanishing his existence and so is time doing. Like he's a toy for those elements.
Well, that's a brief and very personal analysis. Maybe I have a great imagination or maybe I'm wright. I don't know. My wife likes his songs so I've listened to them from time to time but I always get the same feeling, like he's always comparing two opposite ideas in all of his lyrics. In his personal life, he has several soul mates and children from almost all of them, so that's why I think he could also be in doubt of loving an only woman. I don't think that's the reason why your boyfriend likes this song. But this coud be an ambiguous song. It's also very difficult to translate lyrics, because beyond grammar, the challenge is to understand what the author actually wanted to mean, and that could be hard even if the song is written in your mother tounge.
Best regards!!!
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