The Second To Last Human Alive

An extraordinarily lucky man is blasted into space and killed in a freak accident, only to be revived nine apocalypses later to find himself one half of the last remnants of humanity. Now he and a woman from this strange future must travel through time in order to escape from an intergalactic zoo run by shapeshifting...

~Two mates one me (TMOM )~ UNEDITED

It's basically about werewolf bestfriends who later meet after they separated and realize they are mates. Amy, the heroine, then realizes she has two mates. Hunter, her best friend and Dean