I've never been scared of my boyfriend before

Up until yesterday.
We were fighting in the kitchen, which has become a very regular thing, I can't remember what he said but I threw a towel at him. I didn't mean to but I hit him in the face. I walked off before he could say anything else I walked away.
He shouted at me. Really angry scary shouting.
Then he came running after me and grabbed me by the shoulder and pushed me to the wall. I tried to push him off me but he just held me to the wall.
He said he didn't mean to do it and that he hates who he is slowly becoming. He said he would never hurt me on purpose but all we do is fight, how am I supposed to know he won't get like that again?
I love him with all my heart, I have done for about 5 years but I don't want to be in a relationship with someone who will scare me.