question for the day

So, question for the day....when you meet someone and start to get involved with them, is ther a point at which you tell them "all your secrets", or do you feel it is expected, for people to keep secrets from each other, potentially for "ever-after" in a relationship?

I wonder, cause I always believed in a fairy tale, I guess, where people were 100% honest with each other, and you don't have to hide anythying, cause people accept you as you are. I'm a little less naive now, but still troubling with the concept of limited disclosure, as pertains to matters of the heart.