I've been there, and still going through it. I have to say that I agree and disagree with all of the answers. If you think your marriage is over (good chance it is), then accept it, and move on.

What helped me? (she wanted the divorce).

First, getting out socially with friends, especially developing friendship(s) with a member of the opposite sex (but keep it platonic damit!). That helps, and you learn something about yourself, and the basics of a relationship, that is, friendship, plus, she can give you great dating tips!

Then, get out there, but beware that your EXTREMELY sensitive to rejection, so be careful not to get your hopes up too high, only to be let down! Stay away from the bar scene, instead, try meeting women in interesting places (hey, maybe that's another question to be asked), heck, even some of the on-line web sites!

Keep your opportunities safe (i.e.: situations where you can avoid superficial rejection)! The point is, the longer you feel sorry for yourself, and blame it on yourself, the worse off you are, and the longer it will take to get over it!

On the other hand, once you had a chance to reevaluate your goals and expectations, you will be that much closer to a new meaningful relationship, but better than the one that left you!