I agree with Yanari. Gotta move past it - yes, easier said than done. I can understand wanting to keep in touch with past loves. Here is the catch - try to avoid seeing them in person at all costs. If you must interact, do it over the phone (the internet is too removed, in person - too intense). Contact them as sparingly as possible. I'd say no more than once every 6 mo.
Here is the other thing. The things I said above only apply AFTER you have gotten over her. Until then, no interaction. The healthy thing to do would be to tell her you can't - not won't, not don't want to - but CAN'T see her anymore. Do this for as long as it takes. You will know when you are ready to interact again, if you do at that point.
So, the question now is "How do I f*cking get to the point where I am actually over her? I know this is going to be rough to hear, but I speak from experience and a psych major (and a mom who is a psychotherapist). You gotta do it sober man. Smoke cigarettes if you want to. Drink a drink here and there. But, if you are getting drunk all the time, you won't be able to heal. You are just extending the problem and grief for the future - and it will take longer.
If you can (and I'm sorry if you don't), find a friend or family member who is willing to be a recepticle for your pain. Someone who cares about you enough to let you spill your guts. This helps A LOT!! I don't know what medication you are taking (as per your livejournal thread), but if it is an antidepressant or mood stabilizer of any kind, drinking will negate any positive effects of it - just to let you know.
Try new things - if you need to move to a new apartment (or a new city), do it! This will help too. Changing your environment can help you find new joys and experiences in life. Being in the same environment and routine makes it makes it harder to escape the pain (because it will remind you of the painful things more readily).
I hope these ideas help a bit. Good luck, I know how devastating it can be.