i think the song is about love, in general- the premise seems to be that he was with the girl before, she left him for someone else then came back, now he wants to make sure he's doing the right things to keep her. my favorite is the last two verses though, it seems like they are trying to come to terms with the unpredictability of love. he is worried that someday things will change between them and they will lose the love they have ('drift apart in the night, never know why and not know how'), but she responds that at that moment they are together and happy ('i don't know darling, but i'm here with you and we're coming to the chorus now') so why worry about it? love might not last forever like we want it to, but if something is good and makes you happy, just appreciate it and accept the future when it comes. that's the message i get out of it.
i think the song is about love, in general- the premise seems to be that he was with the girl before, she left him for someone else then came back, now he wants to make sure he's doing the right things to keep her. my favorite is the last two verses though, it seems like they are trying to come to terms with the unpredictability of love. he is worried that someday things will change between them and they will lose the love they have ('drift apart in the night, never know why and not know how'), but she responds that at that moment they are together and happy ('i don't know darling, but i'm here with you and we're coming to the chorus now') so why worry about it? love might not last forever like we want it to, but if something is good and makes you happy, just appreciate it and accept the future when it comes. that's the message i get out of it.