Someone i used to be really really close friends with recently decided that the friendship was over. There was fault on both sides and the friendship had been in decline for quite a while but i kept making an effort hoping that magic one day things would go back to how they were (unrealistic i know), whilst she decided that it wasn't worth struggling on and that the friendship was over. I'm guessing she isn't giving it a second thought and is merrily carrying on with her life but I just can't seem to let it go. I keep mulling over what I could have done differently or how i could have been a better friend. Any suggestions on how to move on?