this song is clearly about a realtionship that keeps going through the same phases.
"and here we go again, with all those things you said and not a minute spent to think that we'd regret so we just take it back" probably is about the things they might of said in a fight, thinking they wouldnt regret what they said, but then they do so they take it back.
and "i'll write to let you know, that i'm alright can't say i'm sad to see you go, cause i'm not." shes saying that she'll probably keep in contact, saying shes fine and how everything is going and then when he leaves shes not going to be upset, but glad and shes trying to reassure herself of that.
this song is clearly about a realtionship that keeps going through the same phases. "and here we go again, with all those things you said and not a minute spent to think that we'd regret so we just take it back" probably is about the things they might of said in a fight, thinking they wouldnt regret what they said, but then they do so they take it back. and "i'll write to let you know, that i'm alright can't say i'm sad to see you go, cause i'm not." shes saying that she'll probably keep in contact, saying shes fine and how everything is going and then when he leaves shes not going to be upset, but glad and shes trying to reassure herself of that.