Should I forgive and move on?

A couple of months ago I went to a fight party with my fiances at a "friend of the family's house. Fight ended early and our children were sleep so we decided to stay longer and enjoy a few drinks. His brother and sister were there also. His brother likes to pick and tease me when it comes to our relationship. I deal with it even though I dont like it. He made a statement about taking my fiance to Miami Beach with him and said things like, "there will be allot of girls walking out with their "****" hanging out. I responded by saying 'See, that is why I have always had an issue with them going to the beach together "because of that mentality. Then the sister and her Friend began to tell me that because I feel that way that means that I am insecure. They began to say insulting things like, "Your man is going to "sleep" with someone else if you continue to feel that way." By then I am defending myself against a room full of drunken people who continued to give their opinion of me and my "insecurity." My finance was quiet the whole time. The conversation eventually got more heated so I said that if they were going to continue to talk to me in the manner in which they were talking that I was going to leave. I turned to my fiance and told him that it was time to go. He acted non chalant and asked why. I said because everyone was getting heated over something so silly and I was no longer comfortable. He and I began to walk out of the house when I noticed he was upset with me. So I asked him why was he upset with me. He kept walking and told me to "**** off." I walked up behind him in shock repeatedly asking why he was mad at me. Out of no where he turned around and push me to the ground (twice). His brother pulled him away from me and after I calmed down I left him there and took my two/our children home. To this day he swears he was highly intoxicated and cannot give me any reason why he turned on me the way he did. I feel betrayed and humiliated and I just cannot get over this even after two months. We are engaged and have been going to church since then. He is treating me better, but I cannot seem to forget or forgive him about that situation. It was Betrayal. I feel like ending our relationship over it, but I feel like I should have done this when it happen. What would you do. Can people change? Or will he turn on me again?