First, time will heal your wounds and just like most things in life, what seems like a crisis at the moment will pass and be forgotten or looked back with good or bad memories.

Go to school. Casually let your friends know that you and your former boyfriend have broken up. Discussion closed, unless YOU want to go into details.

When you see him, if you are both still on good terms (ie., could be friends), smile and say hi. If not, try to be casual and ignore him.

You may or may not be upset or jealous when and if you see him with a new girl. Remember though, it works both ways. And who knows who is waiting around the corner....