When it comes to people not treating you right, it doesn't matter how long you have been friends for or how much you love them. How people treat you shows if they should be in your life or not. If this friend is not even there for you, then she (or he) isn't even a friend, because that's not what friends are.
Pushing people out of your life may seem hard at the beginning, but I promise it is worth it. If these "friends" are only radiating negative energy to you, you need to get that away from you so that you can be positive and have positive energy, and if that means cutting them completely out of your life, so be it.
I promise, its nothing to get upset over friends are going to come and go and some are going to hurt more than others.