needing advice on fiancé

Auburn

My fiancé is in the air force. He is supposed to come home any day now from tech school. We are getting married on July 22nd 2017. So this weekend. My fiancé and I usually have the occasional argument. and its never very bad, we always make up. But here in the past few weeks I am seeing a side of him I have never seen before. He is so mean sometimes I can't even believe this is the man I am going to marry. I don't know what is wrong with him. We only get to talk on the phone which I know is part of the problem. He hasn't seen me since May. He gets mad at me for telling him little issues and he yells "Shut the f*ck up!!" to me. I feel like he has lost all respect for me. I don't know how to fix our broken relationship. I just feel so alone.