It pains him when I do this…

I find myself pushing him away whenever he tries to be affectionate or show love. We've just reached a year together this month, and I’ve realized that I do this constantly. It's because I get triggered by my past relationship, where my ex would always put his hands on me. Even though that was back in 2021, I still feel afraid. I'm not sure how to tell him about this… I worry it could be used against me, as I've shared my trauma with others before, only to have it repeated. I fear the same could happen with him, but it also hurts me to see him upset when I push him away. I really need advice on how to handle this.