I'm mad at my friend for not moving in while I'm abroad.
You are angry because someone didn't move in while you're not even there?
I've known him for a long time. He knows I wanted him to move in after my graduation.
You expect a friend to move in at your whim, but what if the friend has other plans for himself? Discussing things with him first would have been adequate. Just assuming he would do it will cause disappointment for all, especially you.
I just want to move on and live my life. Stop talking to me.
It's not reasonable to think that just because you want someone to do something for you, that they will agree. If this was really important to you, you should have had a more firm agreement with him.