I dated a girl in college for 8 months. It turns out she must have a mental illness, but has never been diagnosed/treated. We broke up one month ago because she said it hurt too much to be in a relationship. She recently spiraled into depression. She told me breaking up was a mistake. She called me, and told me that at the end of our conversation she was going to commit suicide. Not a threat, just a fact. She said because of her condition we couldn't be together, and she can't change her illness. She said she can't imagine a life without me, so she was going to kill herself. I told her if we got help there could be hope for us. This kept her from killing herself. We only dated for 8 months, and given all the trauma (after we broke up) I won't ever have romantic feelings for her again. But her belief that I will is keeping her alive. What do I do?