I could be over analysing, but is that a breakup song?
To me it sounds like she's moved out of his life and he regrets not trying hard enough to stop her.
'Delilah I can promise you that by the time that we get through the world will never ever be the same, and its all because of you."
By the time it all blows over, he won't be able to look at a lot of things the same way without thinking of her?
Yes?
No?
OP is silly?
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Op is one big silly head.