Sorry to hear that dude, I went through a pretty tough breakup in college, it was my first adult relationship, the first woman who could have been "the one" and when we broke up all I concentrated on was trying to get her back. Looking back was that completely the worst thing I could have done. Not because we really should have stayed together, but because I moped on what I didn't have instead of what I did and who I was. It's easy to look back with 20/20 vision, but at the time I was not thinking straight.
You've gone through a significant part of your life with her, so you're going to feel a loss. But playing a mind game right now is not going to get you anywhere - that advice is for people trying to defensively protect their egos after a burn.
Nobody can dispense a prescription for this based on three paragraphs. They don't know the three years you've had with her, what your personalities and needs are. How you've grown together and apart since then. I do think that through college people grow a lot and often grow differently. That's just reality. I would just offer the general tips to be honest, with her and with yourself. And try to surround yourself with as many close friends and supporters as you can. If she was your best friend (or the person you shared all your daily news with) you should keep yourself communicating with other close people to mitigate that loss of personal bond. and try not to make everything about her and what you no longer have. Also, each day it will get easier. It might only get a fraction of a percent easier each day but it does get easier.
Good luck
Oh yeah, and don't be this guy...
http://www.nbc.com/saturday-night-li...nise-show/2527