I think everyone has had this friend. It is a really hard thing to listen to the same ol’ thing over and over. Is she asking for you advice? Is she just wanting to vent? Sometimes silence can speak the loudest..perhaps your lack of engaging and response will send a message that you don’t care to continue playing the same old record over and over. Maybe if she brings it up, you change the subject or suddenly have someplace to be. After awhile, she may gain some self awareness. I know from my own personal experience, back when I was younger and thought my lovelife was the end all, be all, I drove many a good friend away with my self absorption about rather unhealthy things. Part of this is due to simply being young but we must all teach people how to treat us..and if she gets the memo that you’re OVER it, perhaps this is a catalyst for change in HER. Best of luck!