I think I know the meaning.
Lyrics say "but ur nothing but a fantasy" meaning they don't know each other. That is why we don't see any scenes together. Enrique says "that ain't the girl I want u to be, the girl that keeps me up and I see in my dreams" in the video there are 2 girls on Enrique's living room. Meaning None of those girls is the one Enrique always think about. Dev says "tell me baby will u be here when I wake up, I DON'T WANNA FAKE IT" which means she dont wanna just pretend the guy is with her every morning. The video continues and they actually don't know that they are on the same place, so they are each having fun in Vegas the video continues, then at the end at the elevator they actually see each other. Sadly the video ends