So sorry to hear that. It is normal to be in the state of mind that you are in after a friend you thought would always be there rejects you and cuts you off. I wouldn't be surprised if this particular friend eventually comes back to you, because maybe his own issues are causing him to feel too overwhelmed to be sensitive to the problems of others at the moment. He may have regrets eventually and try to come back into your life.

I think the issue goes beyond you....it's something with him having difficulties taking care of his own needs. He might come back and apologize when he's done dealing with his own stuff, but then it's up to you whether to let this friend back into your life again. I know it's hard to come to terms with all of this, but with time processing what happened, it will get easier to focus more on others who are supportive....and most importantly, yourself.