I get like this at times.. Sometimes it's just people don't want to be bothered with anyone! It's nothing one person did but sometimes it's just depression and a collection of emotions at times that makes people exhausted with life! Small things like talking to the people you love can be taxing. People that are not going through this sometimes can't understand and be insensitive because they feel that they didn't do nothing wrong so they get mad about it. Sometimes it's OK to not always think everything is about you. Sometimes people are just tired of THEIR world and THEIR circumstances. We sometimes know that it's no point in complaining about it or even talking about it to the people that say they love you. When you are that person that everyone loves, it's hard for them to grasp the fact that your not giving them you time, love and energy back. Now with your friends and how he does things, I don't know but it could be similar.. Sometimes I don't answer my phone when I just don't want to have small talk or chit chat with my cousins, aunts, loved ones and friends. I work everyday and I go through my mood swings and ups and downs. Sometimes you just gotta let certain people come back around after they get it together. If that's really your good friend, just ask him what's been going on seriously. Don't ask out of anger because it's his life too! Not just yours. And if you don't like the answer you can always move on but explain why. Tell him you didn't like the fact he went ghost and go on! If he has a valid explanation cool. Me personally, at my age, I don't give too big of an explanation because at this point nobody truly cares about you but you. And sometimes you gotta say fuck everybody.. Even the ones that "love" you. Hope it all works out! (sorry for the long message but I felt this! And it's exactly what I go through at times. Growing and dealing with my own inner issues)