Q by Evan Mandery.
"Shortly before his wedding, the unnamed hero of this uncommon romance is visited by a man, claiming to be his future self, who ominously admonishes the protagonist that he must not marry the love of his life, Q..."
Almost didn't get this as I don't like romance novels or love stories but was curious about the time travel element. If done well it could be very good...or...it could be very silly. I'm only halfway through and I'm really, really enjoying this book. My cold, hard heart is breaking already and I love the writing style of the author.
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Before that I read The Memory Artists by Jeffrey Moore, which I also enjoyed:
"Noel Burun has synesthesia and hypermnesia: he sees words in vibrant explosions of colors and shapes, which collide and commingle to form a memory so bitingly perfect that he can remember everything, from the 1001 stories of The Arabian Nights to the color of his bib as a toddler. But for all his mnemonic abilities, he is confronted every day with a reality that is as sad as it is ironic: his beloved mother, Stella, is stricken with Alzheimer's disease, her memory slowly slipping into the quicksands of oblivion. The Memory Artists follows Noel, helped by a motley cast of friends, on his quest to find a cure for his mother's affliction."