what Will you loose if your partner says the current relationship is over

Okay.. when people say they are not over a
relationship, its practically because they miss
some shared memories, moments etc.
If your partner decides to tell you It's over,
what's the first thing that rushes into your mind?
I believe that's what you can't stand to miss/lose
in that relationship if it falls apart!
Hence my question;
What would you miss if your partner declares
your current relationship over?