You're in denial. This is the first stage of grief (and breakups), and nothing to be surprised at.
The stages are:
[]Denial
[]Anger
[]Bargaining
[]Depression
[*]Stabbing her in the face hahahaha how do you like me now bitch that will teach you please take me back oh my god what have I done now
Just work through them as nature intended, and you'll be fine.
Yeah, no offence mate but you can cram that shit.