im so sorry man.. after my breakup i had that same pit in my stomach for about two months.. sucks! every night you think of her, every second of the day, almost every dream.. and your situation seems even worst.. the little girl involved and the length of your relationship.. but hey, your done.. fuck her! dont ever go back! i made a mistake to take my ex back once and i regretted it.. she didn't deserve you.. my relationship ended about 3 months ago, and it feels so good to be over her.. and for now, think all the negative things about her, not the good things.. save those for when your completely over her..

hope you feel better soon..