I've tried over the years to contact my ex-BFF and she has managed to ignore me every time. I don't know how she can! But I've finally given up. But I still get the urge to write her.

She dropped me because I dropped a mutual friend. Basically, our friend was bipolar, and I slowly started cutting her out of my life because of the way she was dragging me down with her (and putting my life in danger during her manic phases!), and my non-sick friend couldn't forgive me for cutting out our sick friend when she was sick.

Of course, the one who didn't forgive me for it was living a thousand miles away when everything went down, so I always felt like she just didn't know the whole story, but I'm sure she thinks she does because we did all live together in the past.

Anyway, that was more convoluted than you needed, sorry. I have no advice. I just know it sucks. I miss her!