I feel for ya mate, it's a shitty situation to deal with. I know first hand how you would be feeling, and it sucks. Shit is gonna hurt, and may do for some time and you obviously will feel lost at times. It's all part of it. It's hard to fill that void. Not knowing exactly your relationship or what has happened It's hard to say how things will turn out, if she would come back or not.
As hard as it is, try hanging out with friends or if you have hobbies or like to do things, go do them. The worst thing you can do is sit around thinking about it, not to say that there's moments you still will, but get out and do things. Go out and socialise with other chicks, doesn't have to be sexual, but sometimes after a break up getting over someone by getting under someone else can help. Exercise i found was good for me, always felt good after a workout and a run.
I lost the love of my life after 8 years together due to her infidelity, and it destroyed me for a while. Whatever you do don't go on a booze filled bender for months on end, trust me it helps no one and you still are left with whatever it is you a dealing with.
A part of me still loves my ex, and probably always will. She is the mother of my children and one of the only people who truly knows me, warts and all. But that's where it stops. We establish a new friendship recently after several years of not talking, for our children's sake, and both of us have new lives with partners.
I wish you all the best mate and if you need a chat, the Kennel family will be here.