The best way to move on is to cut contact completely for a while and find other things to fill your time with. It will leave a bit of a void in your life, but you'll find something else to replace it soon enough. If you're in regular contact with her, find something else to do instead of talking to her. Your best bet is really just getting involved with other things and letting this go as much as you can. Take up a new hobby or sport, make some new friends and spend time with them. Or reconnect with old friends or something.