Lyric discussion by YamiLava 

I pretty much agree with cal1989.

Except I think that she has become resentful about the relationship and picks on every little thing about him (that she probably found lovely at the start of the relationship). It seems that she's just tired and bored of the relationship and her patience with him is lessening.

But she's still trying to hold onto their relationship and what it was like at the beginning (the foundations). She probably still has strong feels for him (left from the start of their relationship), but she knows that they're not right for each other and things can't carry on like this. Only she can't bring herself to 'let go' of what they used to have.

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