The fastest way to get back with an ex girlfriend is to either move on or appear as if you have.
If the break up was from something your girlfriend did then you have to wonder if she is worth the effort? If it was something really silly like her flirting with another guy at a club then it may be repairable.
Before you go off the rails and immerse yourself in too many bottles of beer think about how you are going to get her back.
It sounds like you got pretty jealous and in the heat of the moment called it quits on her.
After a few of those beers you are probably thinking what a moron you were and how much you are already missing her.
The fastest way to get back with an ex girlfriend is make sure you are sober then contact her.
Make sure you are sober and contact her.
Tell her how stupid you feel about what happened.
If she is mad at you about the break up then it may take a bit of work to get her back.
Say you are sorry and leave it at that.
If she wants to carry a grudge let her.
Get out with your mates and have a good time.
When she sees you out and about looking happy she may begin to wonder if her anger is worth not being with you.
If she approaches you and tells you she is sorry for flirting and trying to make you jealous maybe its the time to bury the hatchet.
At this point any game playing by you would not be helpful.
Tell her it hurt the way she flirted but that you should not have over reacted like that.
Tell her you love her and it should all work out.
Fantastic.