How To Cope With A Situationship Breakup

How do you mourn what never was?
It’s not a breakup; not really and sometimes not even close. But it can hurt like one. Actually, it can even hurt worse. Someone who meant so much to you only days before is not part of your life anymore and you’re just meant to be fine?
It’s difficult to understand how someone who could potentially make their mark on our lives is gone the next day as if they'd never been there in the first place.  What then are we to do with the memories, the private jo...