I need advice

My bd/bf cheated on me multiple times in the beginning of our relationship. I’ve had so much trouble recovering from it everything triggers me. Even in public if I catch him staring at other females it freaks me out. He told me that if I feel like that I can pull him to the side and let him know. Every time I pull him to the side and try to talk to him he gets mad. Im so confused. Idk what to do ik I need to get over the cheating and just move on but I can’t and hes not helping.