Boyfriend Cheating on Me

Date: 6/8/2020

I was with my boyfriend one evening, and watching his snapchat story which must have been from earlier that day. He has a bunch of snaps of him on a train with another woman, who was holding a baby. In the pictures, she is looking at him lovingly and vice versa. I felt so sick inside and devastated and hurt. He must not have remembered that he added me on Snap. "So what did you do with your girlfriend earlier today?" I asked casually, trying to trick him with that tactic where it's like pretending you already know. He said they went on a beach trip or something, and then realized that I tricked him into telling the truth. He seemed scared. I immediately freaked out, telling him that this entire thing has been a lie and that he's a cheater and a liar. I told him I have to cut him off, and that we would never date again. He was so upset and trying to argue with me to stay and that he'll change. I told him he'll never change and then left.