The past is the past, you both are suppose to create memories of the present and look into the future. He will have to look at all your good points and a happy future together instead of just think of the past incidents. It's quite difficult for you to do anything besides being yourself and loving him. A person's mind is controlled by themselves.

Whatever the incident is. The past is the past. You can't dwell in it. The reason why there's such thing as forget, forgiveness and regrets. If you can't take it then might as well make sure you choose wisely. If not, just accept it that that's the past and what you hold is the future.