25 Days in Athens by Jack Strange

In the sun-soaked street of Athens, someone will get their happy ever after, but who?
 
 Three years ago, Will turned down Ollie’s proposal.  Now, he’s been invited to his ex’s wedding in Greece, the very place they once dreamed of saying “I do”. Faced with the consequences of his decision all those years ago, Will has twenty-five days to figure out whether to tell Ollie he made a mistake and try to win him back, or lose him forever.  
 
 But a chance encounter with his childhood friend Sam, who just happens to be impossibly handsome, complicates everything.

Against the stunning backdrop of ancient ruins and vibrant nightlife, Will must confront his past, his desires, and the true meaning of love.