Tifa's story is concerned primarily with finding out what has happened to her and how to reverse it, so there'll be a lot of 'talky' chapters like this one.
So far, nobody has guessed the identity of the person in Chapter 10 (Limbo). I will reveal this person in the future, but not for a while. Here's a clue; since this fic takes place in the Kingdom Hearts 'verse, there's no reason why Tifa should be talking to a character from FFVII. Think outside the box (game). Remember, this person shows no signs of recognising Tifa, nor Tifa of them.
Anyway, on with the show. Btw, the formatting went a bit nuts with this one, so keep an eye on the speech marks to figure out who's saying what... And yes, its Tifa talking to Zack again.
Disclaimer: SquareEnix own the recognisable bits.
Tifa.
Forgotten: to cease or fail to remember; be unable to recall.
"…what …what exactly happened to you…?"
"I forgot… and… I was forgotten…"
"…you were forgotten…?"
"…we only truly exist… in the memories of others…"
"…what do you mean…?"
"…as long as the people we once knew… the people we loved… as long as they remember us… we continue to exist… …but if they forget us… then do we really exist?
…how can something exist… if nobody can remember it existing…?
…how can I hold on… to my memories… if there is no-one to share them with me…?
…how can I hope to remain whole… if… if little pieces of me… of the memories which make me who am… if they are gone…"
"…please… please don't think like that… you can't be forgotten… not entirely… I won't believe that…
...truly… some memories have to… have to be consciously recalled… that's why they can be… mistaken… or wrong… or forgotten…
…but some memories are locked deep within your heart… those memories are different… they can't be forgotten…
…that's why you're still here, right? …because someone, somewhere… holds your memory deep in their heart…"