It's meant to make those separating, splitting up etc. feel better about the split. In the past it could possibly fooled folks because society wasn't all that mobile, most people lived and died in the same town where they were born. Today it doesn't hold water, if you sit and pine for somebody & await there return, you'll die 1 lonely person
it means that if the person you love wants to go their own way, and it requires you to breakup, then you should because the relationship may not be meant to be. If the person comes back then the relationship is meant to be.
it's kind of self-exploratory buit kinds of mean that if you love something or one you will let it free w/out really worrying about the past yall had 2gether and if the person or thing ccomes back it was meant to be true love if not u tried......i been down that road before;}