Responses

I actually thought it was the opposite.
They are reincarnated into a new life but in the old one Eren died in front of Levi. That's the hand holding scene that we get a glimpse at in a flashback before we get the truth at the very end of the story.
Levi blames himself (well his past self) for Eren dying. It's survivor's guilt at it's ugliest because Eren is alive and right by him but he is haunted by the past and the deep fear he will lose Eren again.
Can somebody tell me what's going on? Why are they crying? Why the sad vibe :( I thought eren and levi were happy together?
http://www.mangago.zone/read-manga/shingeki_no_kyojin_andromeda_doujinshi/bt/311518/Ch0/36/ this part got me confused too
So levi was still hung up over past eren? But isn't the present eren is still eren?