I know this sucks, but my daughter used to do crazy stuff like this all the time and it was to try to get to me. When she found out it didn't faze me she quit doing it. She always called again. My guess is he unfriended you because he knew it would upset you. Focus on you and do nice things for yourself. I'm glad you didn't answer the phone. Let him find out what it's like to only be acknowledged at someone's convenience. Hang in there.