I was fucking Dita for nearly a year by then. She had two best female friends, they both had boyfriends, and one Saturday night they whisked us all to a dance club in the small, but proud and ancient hometown of one of the guys (~12k current population, far end part of a 80mi long agglomeration along the big river). It was a new venue, the main DJ was his school pal, that sort of thing. Only there I learned that Dita too had attended the local school for a couple of years (commuting there with no apparent logic, but stranger things happen in life, perhaps parent's relations could explain it). Long story short, she too knew a lot of those guys, and was friendly with them, especially with one remarkable specimen I realized I had already heard about from her. And she, let's say, swiftly went outside the approved parameters space with him, at a phase in our relationship I considered exclusivity as important.
Even so, all I wanted was clarity, but the situation rapidly escalated, all the way up to one too sharp a move from a mass fight. And she went with him. And her friends accused me for causing the disturbance. Obviously overstayed my welcome and already more drunk I probably should have been, I stormed out of there mad as a bat from hell. Come the early summer sunrise, I found myself squatting on the riverbank hurling pebbles along the mirror smooth water of the hydroelectric plant lake, with still over a hour to kill till the first train back to the capital.
Laura, she walked along the flood dam right out of the rising sun, clad in much too light a sundress for the chilly Sunday morning, but with not a touch of makeup on her face and energy of someone fresh out a good night sleep. Not for a lone boat making waves out in the lake and the sleeping town somewhere we were alone for a mile, so of course she had noticed me too. Forty feet away she stopped.
"John? What are you doing here?"
"Waiting for you," I said, standing up. It was already truthful by then, and even on the big scale of things, absurdly logical.
She skipped to me, and we hugged.
It's just such perfect opening in my mind. The encounter is improbability on cosmic scale, whatever is told next can't be meaningless. No, neither was stalking the other, neither knew other could be in that town, both are likely there by unplanned chance for a time measurable in hours. John hasn't met Laura since before he even knew Dita. They haven't really be lovers, I think, but if not then only very nearly not, and they may have long and varied dynamic between them. And yes, there's a lot of symmetry.
(Say, Laura was a queen bee in school, everyone had a crush on her, so nobody loner Johnny wasn't in any way special even if he might try to claim he had crush on her before her fame. But then Laura was dethroned by a contender, declared a slut and unpersoned, and John was one of her very few friends then, platonic by choice to not take advantage on her, and also, he might have had a girlfriend or four, now himself a social force to recon with. And they went different ways, not to hear or see from each other till now.)
Dita will want John back, in fact she will met him later the same day with like, "where did you disappear?" Playing offended he left, but willing to forgive. She doesn't want the other John (okay, that name probably has to be changed) as a longterm relationship although the one quickie was absolutely on her bucket list, and now checked off.
The guys may think differently and may even attempt a trade on her, for rather disastrous results probably as she's not a girl to accept such. She may go all "you can't dump me, I have nuclear weapons" girlfriend nightmare, or not, I really don't know.
ETA: but yes, as I see it, it's a small town, small country, small world dynamic where everyone knows everything about everyone, everyone cheats on everyone, in love and business, and can't really get very far from each other even by jumping oceans as they are tied down by very long roots of many generations and tangled histories.
However, I don't know what the story is all about at the end either... yet, at least.
...and if someone is short of a cosmic chance meeting with totally different content... yes, it's probably done in principle uncountable times already.
(I would neither confirm nor deny it may have happened.)