Drake and Elena's relationship is a topic spread thinly across the game. There is the cryptic exchange between Drake and Sully about Elena "still wearing it" and the final scene where Drake recovers a wedding(?) ring.
This made me very confused throughout as I thought I had missed something from Uncharted 1 (which I have never played) or Uncharted 2 (which I might misremember).
From some research, I have confirmation that "it" is indeed a wedding ring and that somehow Drake and Elena drifted apart before U3. I also see people mention how they've indeed married or been engaged and that it's been two years.
My question is: What's the whole story on this topic and where is it explained (if anywhere)?
I'm assuming the whole thing might just be implied (after all I managed to guess as much myself), but I would like to be sure.