Most Helpful Guy
It's programmed behavior, like "autopilot". Even when relationships end, you were a couple so long, sometimes you accidentally slip back into "couple" mode. It could happen to one or both. The feelings will fade over time, though. If you honestly want to restart the relationship, you'd probably have to start all over again from scratch. What existed before no longer exists. Building on that is like building a house on sand. It'll collapse sooner or later.
Most Helpful Girl
I see the sure signs of 'He/she' Not Ready nor Raring to be in a Real Relationship here, dear, and with the writing on the wall and all, they may say all of the sweet things one day and have a change of heart the next because: They still want you in their life with no strife, they want to come and go as they like and not have to answer to you on a daily basis and It's... Easier for them to be a friend till the end because with the Big "C" which is Commitment, this means being hooked at the hip and they are Not into being two birds of a feather, even though they like to use Squawking instead of Talking for being in a cozy nest once more.
Good luck. xx