Well, getting dumped is an artform I'm familiar with so instead of continue my fetal position laptop viewing, I've compiled a Reference Guide to Dumpsville! Population, You!
Do send an email to him stating your feelings about the break up knowing he may or may not answer it. It doesn't have to resort to namecalling or bashing, just a simple email that will clarify what was not dealt with accordingly during the relationship. It doesn't matter if he reads it, this is for your benefit. It's your closure, not his.
Don't keep checking his facebook/your phone for texts. They are not coming and his status will not change to address that "Meghan I made a huge mistake and I'm an asshole with some deeprooted communication problems and I'm sorry." It's not going to happen. If alll else delete him so you will stop question who the women are that are added. He is their problem now, not yours.
Do sell the stuff that he will not claim from your house on Ebay and buy yourself something nice with the profits. The batman costume will bring other people joy and burning it is just going to make your place smelly.
Do change your locks if he 'lost' or will not give back your housekeys. A 15$ charge and angry talk with your landlord is worth the cost of waking up everynight wondering if someone is hovering over you or looking to boil your cat.
Don't go hook up with someone to try to feel better about yourself cause you're feeling chock full of fug right now. It's not going to validate you or make you any better to use this person as a sounding board for your esteem. You're using someone as a masturbation tool and you will feel icky afterwards. I know this from past experience.
Do go out and get drunk but not within 3 days of the actual break up. At that point you're far too vulnerable and likely to drunk-cry, drunk-dial, drunk-rebound, or drunkedy drunk drunk trainwreck. Wait, collect your thought, then dive into the bottle of tequila and enjoy!
Don't feel like you have to be strong all the time. It's okay to cry. It's okay to miss him and feel sad about the good times that you had together. It's okay to look back with nostalgia. It's alright to smell the shirt he left that smells like him and feel sad cause you know it's gone. It's okay to have manic fits of anger where you want to kick him and claw at him and make him understand how much he's hurt you. It's okay to feel the sudden and sharp pain of someone being plucked from your routine. It's okay to miss the in jokes and not have a shelf life for how long you're supposed to mourn. It's alright cause you know at the end of the day you still believe in love and this has knocked you down but the bruises will heal while his scars are just rising to the surface.
and DO realize that this chapter has ended. But the story is far from over, and look forward to turning the page.