GET OVER IT

How do I get over a boyfriend that cheated on me? , I know, I know I dont want to hear “just dump him” because I love him and I have a child with him, and I only want to be with him, and I know why he did it because I was needy and the relationship was terrible at the time and if I wasnt pregnant I probley would of done the same. but the point is is that he is the only one for me But I cant get over how much he hurt me, I walked in on it in our own home and he was hiding it from me for a week, and he took the girl out on limo rides and took her out every where but they werent going out she was just a hoe to him, hes made it very clear to me that he loves me and only me cause he begged me to be back with him and made it up to me, BUT I JUST CANT SEEM TO GET OVER IT I STILL CRY aBOUT IT, even though I know he is sorry and we are both just trying to move on with our lifes, I just keep thinking is he going to ever do it again. I NEED TO GET OVER IT HOW DO I DO THIS?