TWENTY MONTHS after he developed a crush, 18 months after he’d fallen in love, Diego, who is enormously appealing but also very canceled, boarded the bus with Jenni and Dave. They were going to the beach, and it wasn’t a big deal—except for the fact that pretty much all of Diego’s friends had dropped him, so, yeah, it was. The three, all 17, sat in a row of orange seats that ran the length of the bus, Diego’s eyes dark, goofy, and sad; his body freshly stretched to almost six feet; his oversize Carhartts ripped on skateboard ramps. This could have been in any American city this past January, on any bus. (First names in this article are pseudonyms.) Jenni kept her face tilted down toward her lap, hidden by…