Ummm I don’t know what to make of this little exchange. I think they say “I love you” as you say that to your friend. Not more…

Oh it’s so much more than that. To me, the whole Gillovny concept is held in these little 5 seconds of “I love you.” It shows not only their love for each other, but also how much they care about their privacy and want to keep whatever exists between them behind close doors.
David immediately noticing that they were caught and Gillian reacting so vividly to that is the answer to all the questions everybody has been asking in the past 25 years. If you’ve been wondering if they see each other some times, if they do have breakfast together or just if they’re close, the answer is they are and they do but they don’t want you to know and if you point a camera on them in one of these intimate moments they share, they will stop whatever they’re doing and you will never know what really happened. Even on a filming set. That speaks volume!