Can you help me help my friend?

One of my best friends has for the past year been absolutely in love and obsessed with this guy, where all she would talk about was him. He is extremely shallow and a player. At the beginning of that year he was nice to her (as a friend) and they would talk. Some random people started to say he liked her (not true) and that they would be a cute couple. She fell hard for him and became obsessive. They grew apart not that they were ever very close and he treats her horribly saying many horrible things about the was she looks referencing her to a certain animal and many worse things. She recently found out all of these things and has been really depressed. I have tried my best to help her get over him and tell her that she can do so much better but regardless of what i do it doesn't help. I am really getting sick of for a year and a bit always having are conversations be about him but i am willing to put up with it because i want to help her. I know him well enough to know that they would never have a chance but she seems to believe that they are destined to get married. I hate to see her this overly infatuated with this guy and crying all the time that he doesn't like her. How can i help her get over him and be less sad?