I always recommend to people in you position that they get a large tub of Ben and Jerry's (or Haagen Dazs, depending on how depressed you really feel), stay for a day or two in your pj's and allow your time to grieve over the fact that he's not going to be part of your love life any more. Cry, wail, scream, shout until you've had all the grief you can stand. Afterwards, give yourself a good facial, manicure, pedicure (if you feel like showing your toes, because I never see the point in Winter) and step out with your head held high, smiling, even if you don't feel like it and remember that there's someone much better out there for you.
Another recommendation is that you write a letter to him, telling him exactly how you feel about him, everything you want to say and everything you want him to be (obviously within the 'grieving' peroid, otherwise this would defy the point). When you finish it, put it in an envelope, put his name on it and finally.....burn it. For some reason, this just helps to release whatever feelings you may have stored up inside.
When you have done all that and got it all out your system, set your sights on meeting someone new. Bear in mind that if you loved this guy (start referring to it in past tense if you can), you may not be emotionally ready for a relationship but you can at least meet some fun new people who will take your mind off the guy you left behind.
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