Twist and Shout: The Happy Alternative

Dean has left Cas in desperation. The war had scarred him and it had scarred him bad. With Cas now out of his life, he's even more lost than he was before. Will Cas give in to the pain of the loss of his lover or will he pull through and find Dean along with a way to create that Polaroid picture perfect life they've both so desperately wanted to share together?
(I just want to clarify that I did not write the original "Twist and Shout". I recently finished reading it and it had bruised and beat my heart to a pulp. I decided to write an alternative ending that wouldn't leave me soaked in my own tears. My writing may not be as fantastic as the original but I'll attempt it. Please enjoy and to all the other fangirls out there, I hope this eases the pain.)