I found out I was being cheated on when the other woman came up to me in a store and confronted me, yelling at me to ‘stay away from her man’. I had no idea who she was, had never seen her before in my life so initially I wasn’t even sure she had the right person. I managed to get out of her that my boyfriend had been seeing her behind my back and that I’d been with him longer. For some reason, the fact that he was cheating with her instead of cheating on her made her even more pissed at me and before I was able to remove myself from the situation she’d slapped me in the face and threatened me with worse if I ever went near him again. Of course I confronted him and he was pissed at her for approaching me, like he had been trying to protect me, claimed that it was just a one-night stand, and begged for another chance. I broke up with him on the spot and never looked back. I heard a while later that she was nuts and had been stalking him to the point that he moved to another city to get away from her.