I think you know the answer to this and that is to move on. It sounds like she wanted to break up and didn't know how. That doesn't mean that there is anything wrong with you. It was just her feelings. I know that this is hard to accept, and it seems hopeless right now, but things will change and you will meet somebody new. You may not want that right now, you may want your friend back, but it doesn't look like that is going to happen.
Some of us have many relationships thoughout our lives, and some don't. The fact is that not all of them last. I don't know the reason that she broke contact with you, it could be something on her end. And I do agree it was not fair of her just to quit contact, but she must of had a reason. Even if it was that she just didn't know what to say. Or the fear of talking to you might change her mind. Whatever it was, I am sure it wasn't something that you did. I think this lies upon her and a decision that she made. Either way, I am sorry that you are going through this.
Are you seeing a counselor or a psychiatrist? I recommend seeing a counselor to get your life back in order. They are a huge support and good at givnig a person direction in life. I am sure the death of your good friend has added to this. You need to grieve the loss. And do it however way works for you. There is no right or wrong where grieving is concerned and no time limit on it. You may even want to write this all down. That often helps me to sort things out. You are going through a lot right now, so be easy on yourself through this.
Keep posting and let us know how you are doing.
PS Welcome to the forum!
Moderator-Depression and fibromyalgia
fibromyalgia, Chronic fatigue, depression,allergies