second guessing the breakup

Hey guys, I broke up with my boyfriend two weeks ago and now I'm just second guessing it. We still have another month of living together so it's not making anything easier. But I cheated on him with another guy and I told him and I broke it off, and he said he didn't care and that he still wants to be with me and that he cannot picture life with me. I pretty much did it for him but I had been thinking about breaking up with him for a while now. It was just a matter of when. But the other day he told me he has already slept with two girls and he was trying to rub it in my face and it hurt a lot. I just didn't know something could hurt this bad. I was perfectly fine for the first week, nothing bothered me at all.. now I'm just upset all the time and I don't know if I want to end it. I love him so much and I will have a hard time letting him go even if he tried rubbing something like that in my face. I just need some advice