In spite of the author own interpretation I see it like this:
She has left him. That is the meaning of the "leapt". And when she did, is already fragile (because of fear of losing her) world crumbled down, the whole city (is world) and even hellicopters in the air. She is put on the status of goddess since she sees it all from above or simply means she is unarmed and he thinks maybe she doesn't care what has just happened to his world (and to him), so that's why she is distant in the skies.
He is baffled by her so much that he feels music when he sees her or when he is with her. He asks how is that possible? Some secret mystery she has in her.
"You've been locked in here forever and you just can't say goodbye" (in spite of the author says it's the girls that can get out of the city) I think it's more beautiful to think he's totally and crazy in love with her. And she is locked in his heart and can't leave his heart even if she is leaving.
"Your lips my lips Apocalypse" means that he feels that when is kissing her it could be the last kiss and it's a goodbye kiss, so their relation will never last because he already know she will leave him one day or another. In spite of the he feels it's a powerfull and precious kiss even if it's goodbye that will bring destruction to his world.
"Kisses on the foreheads of the lovers wrapped in your arms
You've been hiding them in hollowed out pianos left in the dark" - This means that this is what he feels she does to lovers like him, kisses them on the foreheads when she will say the last goodbye and leave them hidden and lost in the dary (like pianos with no sound or sould just forgotten and cannot be heard by her anymore)
The rest is pretty obvious they know and share secrets and good times since they were kids and he loves her since then by all the memories and a locket that she gave him that he hangs to him when he goes to sleep.
In the final words he says that he will be always be there for her when she wants. Even if she leaves him. He will still lover her and always will...
In spite of the author own interpretation I see it like this:
She has left him. That is the meaning of the "leapt". And when she did, is already fragile (because of fear of losing her) world crumbled down, the whole city (is world) and even hellicopters in the air. She is put on the status of goddess since she sees it all from above or simply means she is unarmed and he thinks maybe she doesn't care what has just happened to his world (and to him), so that's why she is distant in the skies.
He is baffled by her so much that he feels music when he sees her or when he is with her. He asks how is that possible? Some secret mystery she has in her.
"You've been locked in here forever and you just can't say goodbye" (in spite of the author says it's the girls that can get out of the city) I think it's more beautiful to think he's totally and crazy in love with her. And she is locked in his heart and can't leave his heart even if she is leaving.
"Your lips my lips Apocalypse" means that he feels that when is kissing her it could be the last kiss and it's a goodbye kiss, so their relation will never last because he already know she will leave him one day or another. In spite of the he feels it's a powerfull and precious kiss even if it's goodbye that will bring destruction to his world.
"Kisses on the foreheads of the lovers wrapped in your arms You've been hiding them in hollowed out pianos left in the dark" - This means that this is what he feels she does to lovers like him, kisses them on the foreheads when she will say the last goodbye and leave them hidden and lost in the dary (like pianos with no sound or sould just forgotten and cannot be heard by her anymore)
The rest is pretty obvious they know and share secrets and good times since they were kids and he loves her since then by all the memories and a locket that she gave him that he hangs to him when he goes to sleep.
In the final words he says that he will be always be there for her when she wants. Even if she leaves him. He will still lover her and always will...