The extent to which your lover idealized you at the beginning of your relationship is really unfortunate, because it means that the longer it takes for reality to intrude, the more hurtful and disappointing it is when they finally realize that their expectations and impossible standards are never met. You each want things to be a certain way between you, and your ideas may or may not match up. Even if they do, you won't necessarily be able to fulfill your dreams of 'the perfect relationship' -- for one thing, that just doesn't exist!
Your lover might not think they should have to voice their expectations -- you should just tune in to what they're looking for in a love affair and respond accordingly, right? Wrong. If either of you has certain particular needs, it's up to you to make sure they're clearly communicated to your partner. Any lingering doubts about whether you want to be in this relationship also hurt the connection between you, so talk those feelings out rather than letting them fester. Talking openly and honestly is key, but it won't be easy. Expect your communication to be difficult at best.