Most of our happiness does not come from the reality of the moment, but what we think is going to happen in our future. We tell a story about how life is going to be in our future. Of course, our story is not accurate and a lot of things can derail our story. And, once we are living our story, I.e., when the big event comes, we are not really experiencing our event, but we are telling a story in our head about our event...this is nothing like I expected, or this is better than I ever imagined, etc.
Most of my sexual fantasies, but not all, have been better than the real experience. Of course, I often make up a story about the event, an exaggeration that if better than the fantasy or the event itself. Often, my stories about love have underestimated the actual event. But, sadly, I have often down played love and its impact on me in stories about a given romance and the lover involved.
Humans live inside their stories. We are perhaps the only creatures on this planet that make up stories and then treat them as reality. And many of us do not realize this is how we function as humans.