Graymouse
Pro Adventurer
That's just me speculatin' though. I definitely see Tifa stepping back and becoming more cautious when she hears Cloud's recollection of the events in Nibelheim.
I believe it could have the opposite effect. I think we will begin to see Tifa's real concern for Cloud. because of his recollection of the Nibelheim incident is so different then her own. Just like we learned in the OG, that is when she really wanted to keep Cloud by her side to look after him because she knows something isn't quite right with him. She has gotten hints since the beginning when Cloud gave her the flower, so Cloud's memory of the Nibelheim incident is going to push Tifa's suspicion into almost a panic mode. This is probably where Aerith is going to play wingman.
Although, I do believe that she will start to second guess her own recounts of the events that happened that day. I don 't really see that pushing Tifa and Cloud apart. Not after the way they have been going on in the first game.