INFPs are dreamy idealists, and in the pursuit of the perfect relationship, this quality shows strongest. Never short on imagination, INFPs dream of the perfect relationship, forming an image of this pedestalled ideal that is their soul mate, playing and replaying scenarios in their heads of how things will be. This is a role that no person can hope to fill, and people with the INFP personality type need to recognize that nobody's perfect, and that relationships don't just magically fall into place – they take compromise, understanding and effort.
I'm not sure if this is really my personality type, but this paragraph is spot-on in describing my 'pursuit of the perfect relationship' and the attendant shortcomings of such relentless idealism.