And here is one thing I must warn you about: it will hurt for a very long time--and depending on your personality (if it is like mine) you may have to deal with the conclusion that if it was "true love" you will never completely recover.
Without drawing any conclusions about your relationship let me say that if you do not have kids involved be grateful--that is what has kept my ex-wife and I tangled together even when I desperately needed to get away.
My ex wife left me after a 24 year marriage. We lived in Houston during all that time and I continued to stay there for 3 more years after the divorce. Unfortunately we would have sex every 4 to 6 to whatever months apart and I realize now that it happened when she got horny (and apparently for no other reason). I also realized gradually that it was harming me a lot more than her because in reality I was always hoping that somehow this meant she would be wanting me back or I was hoping that one "magical" night together would bring us back together.
Eventually I simply had to leave Houston to really begin to heal--perhaps the only thing that will help you get over your SO will be to physically put as much distance between you and that person. Now I have come to accept that there is a certain place deep inside however that will always be tender and somewhat bruised.
Good luck and although I'm not going to tell you to abstain I would say be very cautious of the booze and other drugs until you are a lot farther down the road toward healing!