Post-Dump
Nearly a decade has taught me one important thing: This is a very long phase. You need to accept this.
Ok, you just got dumped. Let the emotion out the best way you know. Cry if you have to, beat the **** out of something, go for a run, post an E/N thread (maybe go for a run first). Be a man, and find someone to give you a hug. Talk it through with your close friends (not hers). Set some kind of time limit. Say to yourself, "I'm going to be a pile of emotional **** for the next hour, then I'm going to start picking myself up." Stick to it, if you're a sulking mess for too long no one is going to want to hear about it.
Inform your friends. People ought to know to be careful around you. If they care about you, they'll help you cope. Put away blatant reminders of her - her pictures, her underwear, her lifesize blowup doll etc.
Go out, live life normally, DO NOT DO ANYTHING RASH. Joining the Army doesn't help, running away doesn't help, you won't get her back if you get into a car accident/attempt suicide, you certainly won't get her back if you vandalize her property. Don't **** her sister/friends, don't go beating up some kid who you think might be her new boyfriend. Use Rule 1 folks, it really puts things into perspective.
Just go on with your life. That's the only thing you can do to really take it like a champ. There's a huge list if things you shouldn't do, because they're very annoying, and you'll feel stupid about it later.
Spend lots and lots of time away from her. This is actually a strange situation. Say you spend 4 months away from her and are feeling great. The next time you see her, it'll take you back about 2 months. Then you'll recover, and the next time you see her it'll take you back 1 month. Then 2 weeks. Then 1 week. See what I'm getting at? Recovery is a long process, and there will be setbacks. Don't think it'll be peaches and cream the first time you see her with another guy. Try to avoid her socially until you're certain things are ok. This may take months or years. Rarely weeks. This is why avoidance is key. You don't need to go out of your way to avoid her, just let her know that for a while, you don't want to see her.
Don't play the pity card. Yes, you're upset and hurt and heartbroken. Tell it to your friends, not to her or her friends. Avoid putting up depressing away messages, profiles, blogs, or anything of the like. Understandably, you want her to know how much she hurt you. It does you little good to do that, remember rule 1? Don't go to the same party as her and sit in the corner looking all depressed. She's not going to want you back, you pansy.
Don't go visit her. First of all, it will hurt like a mofo. Secondly, girls are evil and will do ****** things like hug you, cuddle with you, tell you how much they miss you, or hit you with pepper spray. Rule 1 - it still applies. She doesn't want to be with you, just wants to make herself feel a little better. If she wants to come back to you, she'll call you up and say so. Being around her is most likely going to annoy her and make you feel really ******. Girls have also been known to employ the use of a guy named Todd, who is only there to make you turn emo.
Don't start looking for answers. If you're smart, you already asked them when you two were breaking up. Don't call/IM/email/fox her friends. Yes, they're close to her and they know what's going on. Chances are, they won't tell you what you need to know. They're her friends first, yours second. I'm letting you know now - if you do take this path, you will find out nothing of any use. Do you really want to know if she's seeing someone else? Do you really want to know if she is in bed crying because she misses you? Back to Rule 1. She's going through her own healing process, she doesn't want to be in a relationship with you. Let it go, man. Her friends will report their findings to her, and she'll hate you for snooping.
On a similar note - DON'T ****ING STALK HER.
The above is the basic foundation for taking a dumping like a champ. There are many little nuances that I can't remember and didn't cover, so be prepared for anything. Of course, I welcome and urge the advice and experience of other goons. The only thing I can guarantee is that life will get better and you'll move on.
For what it's worth, I got dumped and quite heartbroken today, but I'm doing all right, thanks for asking.
It's almost certain that anyone who has read this and is going to get dumped for their first time will not follow my advice.