Cut out?

It's a strange feeling when finding you've been intentionally cut out of someone's life without notice or reason. Messages are left unanswered, soon contact dwindles, then ceases altogether. And soon you find you've moved on, not by choice, but by routine. Each day, it becomes more and more normal to not hear from someone. 
But then the strangeness occurs when you finally do run into that individual again, by chance, in the strangest of places, where you'd never expect to run into them.
And instead of a cheerful reunion, you're met with an awkward greeting, like they hoped you wouldn't notice them or acknowledge their presence. With the clear vibe that this chance meeting can't end soon enough. So you fumble through an uneasy conversational exchange, and make with a hasty retreat, and then try to come to terms with what just transpired. 
Best to move on I guess... or Cut and run as they say.