I need help

I’m 16 and I know I probably sound like a kid but my boyfriend just broke up with me out of nowhere and I’m at a loss as to what to do or feel. I fell in love with him after a couple weeks, and I thought he was the one. Every day I was with him felt like a new adventure and I’m struggling to cope right now. I feel numb but I know as soon as I wake up in the morning it’ll hit me like a train. Does anyone have advice for how to deal with a heartbreak?