When Maddie and David exchange their "I hate you's" and then kiss ever-so-sweetly while sitting on the trunk in his apartment, this single, spectacular moment encapsulates their entire relationship better than any other point, episode, or multi-episode arc in the series. It shows how aware they are that they drive each other crazy, how much they truly love each other (even if they can't quite exactly say it just yet), and how, with the complete absence of anyone or anything around them in David's unfurnished living room, all that really matters in the world to each one of them is the two of them... together.
Through the magic of denial, my view into the shared life of David Addison and Maddie Hayes concludes with David overcoming his final hurdle in "I am Curious... Maddie", and the "moment on the trunk" mentioned above seals the deal for me that they will live spontaneously, methodically, and ultimately... happily ever after. It's that simple.
P.S. The icing on the cake of this imposed fairy tale ending happens a bit earlier in the same episode in the surveillance van, when Maddie allows herself to bask in truly visible joy in David's humor (not to mention the subsequent wacky "case-work") more than ever before... and at the end, when as they walk outside to face the next morning's sunrise (which is fitting following what, for me, will be the last seen round of detective work in a show called Moonlighting), she states, quite simply, "I feel great."
She has realized that she is already where she wants to be, and one episode later, David will fully join her in that place.