Ex best friend

Lu

So a best friend of mine was supposed to come over on my bday (jul 29) and celebrate it with me and never showed up. Then she was supposed to come over on aug 11 and chill. She said she was on her way and never showed up. I tried contacting her numerous times from then till two months after. I saw her post on fb & yet she never messaged me. After so many tries, i told her it hurt and left me wondering what i did wrong (we were *very* close) and she told me she had depression. As someone who has had major depression and ptsd for 12 years, I understand but it still hurt being stood up. Being stood up by her is a frequent occurrence. Even other friends in our group have known this. I want to forgive her and be there for her but she makes it hard.. What should i do? My bf thinks i should drop her because she does this all the time but i keep finding myself wanting to talk to her like old times. Do you think those times are too gone? I wanna makeup with her so bad but im always running back to her... :(