if something is too good to be true, when the world stops turning as soon as you recognise those symptoms you know that something is "perfect".
just like a perfect relationship. when people love each other so much that they wont ever let go off each other and they are practically glued to each other.
like for example the in the end perfect relationship of :
superman and luois lane
or romeo and juliette
or kidd and chaa
or spiderman and mary jane.
all those figures have something , they have perfect relationships , e.g. they would do everything for each other.