Anxiety and mentally strained. Me out.

My fiance is a good person. He loves me.. we are about to be married in a year but when he is angry due to any trivial reason, he shouts at me, say mean things to me. This has become very regular. Reasons for being angry are very trivial like saying something to which he doesn't agree to, not picking calls, not doing video calls etc. I am with him since last 4 years. I have adjusted to many things. I do not even raise my voice at him but I am treated as if I am at fault. He blames me for everything. When he is angry, he does not even listen to a single thing. When he cools down and try to explain him about his behaviour, he thinks I am pointing fingers at him and says that since he has cooled down, I am trying to impose myself though that has never been my intension. I am very stressed. Please help me out.