I suppose I should give advice ^^
I know it's hard when you go to school with them, but this is what worked for me before:
- Don't talk to him (you seem to already have this down

)
- Don't talk to others about him, unless it's to vent or be angry with good friends (like here ^^)
- DON'T mourn over him being gone; he was obviously a jerk, and you're right, you -don't- need him
- Remember that you never "need" anyone to be happy, unless it's someone you gave your entire soul to (via: Marriage, or some other massive commitment. Even that is often negotiable.)
- Be happy that you are removed from his presence, no matter WHO caused the breakup. Aren't you happy that he didn't keep this going? Maybe he was cheating, and got tired of keeping up his charade here. Who knows. You may never know the truth for certain. What matters is: You + Him = Gone. That is a truly good thing, from what I can see here. Be relieved. His absence has made you available for some true sweethearts out there.
- You will find someone else. Someone more magical and wonderful than you ever thought you could find. I went through a painful breakup a year or so ago, and it felt almost exactly like this, and it was very similar. I was depressed for months... but here I am now, engaged to someone I didn't know I'd ever meet. Someone so infinitely greater and more wonderful than anyone else I've ever known. That person will come, just keep your eyes open.
- Don't dwell in the past. Feel the hurt, feel the rage and move on. Try not to get so caught up in the "what did he do?!" antics that you forget to live your life and move forward. His mess is his mess now, it's not yours anymore (thankfully). Let him be in his own mess and problems and love conflicts, leave him be. Free yourself (and your heart!) for someone that can treat you better.
best of luck to you