Here is a link to the discussions about the ending of remember 11 at TLwiki.
http://tlwiki.tsukuru.info/index.php...inity/Spoilers
The ending is very confusing and here are some insights about the ending. Even with this however, I can't still fully understand the ending and I think most of it is just speculation. However their discussion helps a lot in understanding some of the mysteries in R11.