wow, i can totally relate. It's pretty hard not to think about someone you care alot about, specially if you were together a while.
I suggest you try filling up your time with things you enjoy doing, hang out with buddies maybe get high? Im not sure what your into but another thing that helped me alot was crying my little heart out. It only works for
some people though.
Its odd how you broke it off because "you didnt spend enough time with eachother" yet here you are thinking about her...
Well whatever you do, DO NOT head for the fridge, because that is how you turn into a fat tub of lard, and its all because of love.