I recently told a friend the same.. if the relationship or what's left of it hurts you, you should let it go and move on, thinking about her or what you had in better times only makes it harder for you, so you should try to leave it behind you.
maybe distract yourself with other things, like games she doesn't play, stay offline at skype, read a book, watch movies, make yourself think of different things, and then eventually things will get easier and better