Heartstopper by Alice Oseman #1

Charlie and Nick are at the same school, but they've never met ... until one day when they're made to sit together. They quickly become friends, and soon Charlie is falling hard for Nick, even though he doesn't think he has a chance.
But love works in surprising ways, and Nick is more interested in Charlie than either of them realised.
By Alice Oseman, winner of the YA Book Prize, Heartstopper is about love, friendship, loyalty and mental illness. It encompasses all the small moments of Nick and Charlie's lives that together make up something larger, which speaks to all of us.