My BFF also did the same, where she just dropped me. We stopped talking for a number of years and then just before she was going to move out the country she reached out to me. I agreed to meet her to hear her out and say my peace but had no intention of mending our friendship. After everything was said and done she asked to be friends again and just recently she apologized for what she did and said she would never do it again. I have to say had it been a few years ago I would've never given her another chance but I've changed a lot as a person and so I gave it another shot and I'm glad I did but I'm careful and take her for what she is. I always say try and what's the worse that can happen? she says no? well then you're back where you were before and you've lost nothing and at least you tried