i can't, i just can't do it 
Moving on in a broken relationship is not an easy thing to do. It will take time to do it , because when you are broken hearted , all the memories that you have shared in your past relationship will be remebered always. And when you always thinking of that moving on is not easy to do. You must forget all the things and memories that you have been experienced to that person. Do other things that can make you busy and do not think about your past. Entertain other people so that you will forget all the bad things that has happen .How to move on this one is indeed very common. There are some pros and cons on how to move on this. Deciding contact with a former lover does look very cruel and may seem unnecessary. However, severing the contact has its own advantages.
When recently broke up, there would be a desire to re-contact a lover even if not aimed back. This raises hopes and habits to keep chatting with the former until the ongoing time. This is what makes you difficult to fully move on.