The Unbeaten Track — Vivien Dean

Insomniac Sean Diaz spends his nights riding the subway around Manhattan, ignoring the people he might encounter, getting lost in the rhythms of the train so he's exhausted enough to sleep once he gets home. A hallucination of his dead high school boyfriend turns it into an obsession, but when Sean sees him a second time, he nearly falls apart.

That's how Judah Morey, another nighttime rider, finds Sean. Concern prompts conversation, which in turn sparks friendship. When Judah invites Sean back to his place, Sean decides to take a chance for the first time in nearly a decade. Dating is new territory for him, but he thinks he's ready for it. He just needs to figure out how to let go of the past so he can take that step into his future...