I dated a guy for six months. One day, we were swimming at the pool when he saw his friends, talked to them for a while, then came back and said he didn't like me anymore. It was my first breakup.
It hurt for a while, but I got over it. What I am trying to say is this: if you get dumped, don't let it bring you down forever. Eventually, you'll meet someone new and just as special. And don't hold it against the guy either. Be polite to him and just try to be friends.