"There comes a point in your life when you realize who matters, who never did, who won't anymore, and who always will. And in the end you learn who is fake, who is true and who would risk it all for you."
Friendships change over time. It doesn't mean you have done anything wrong. It doesn't mean your friend has done anything wrong. Stop trying to figure out what you did wrong or blame the other person. Remember the friendship you once had as around memory.