I used to have a problem with cutting over my exes. You can look at my arm and see over 100 scars cause of it. What I did after I realized cutting wasn't the answer, I just went and hung out with my friends to get my mind off of it. If all else fails, hang out with one of your family members. I used to have to do that, heh. If you ever want to talk I'm here for you.
Take care of yourself.