If he's your boyfriend, and he's not talking to you, that's a problem. So, like everybody's said, just go up and approach. He might just be going through something, or maybe he's nervous about a new year... or, sadly, this may be the time to separate.Just remember, whatever happens, talk it out before, during, and after! Before, with yourself, so you know what to say and what to think. During, because you always, always, give people a chance to speak. And after, to relieve yourself and let the emotions settle.