Why do i still miss her :(?

we were together for 3 in a half years. we were engaged. we both did extremely hurtful stuff to one another. but we still had tons of laughs and were crazy about each other. I called off the engagement then she ultimately called off our relationship. now its beeen 7 months. and i miss her still like crazy.. i love her still. why does it still hurt... i havent kissed a girl since her.. i want to move on cause i know she hates me(im not sure why) and has spreaded lies about me to where ive lost friends :( good friends :( it was a very bad breakup. why do i even still care? how can i get over her? ive mourned heavily, given time to friends, prayed, wept bitterly, and lately ive been staying active with friends, but i still think about her... honestly i want her back.. but i know i cant :( so how do i move on :'( cause frankly.. this sucks.