When I bumped into Jeff at a friend's birthday party, I noticed how he went out of his way to introduce himself, and how, later, his large blue eyes lingered on me as he walked out into the cold New York night. I'd just turned 29 and had spent most of the past decade breaking up and reuniting with Jason, a Bradley Cooper look-alike whose laconic moodiness I confused with depth. Newly single, I asked Jeff out...