please advice

I found naked pictures of all my boyfriends ex on his phone and he is still talking to all of them like he doesn't even live in the same country as his ex's. People at my church says that they have seen him flirting around with some older girl at his church and many people think they are dating. On thanks giving day he lied to me that he was at his pastors house but his brother said he was at the gurls house all day and all night. I confronted him and he denies he is not dating the girl and that they are just friends but people are talking a lot about it.we broke up and he came and begged me I told him I will come back to him if only he brings the gurl to come talk to me and tell me they are not dating he promised to and did not it's been 3 months now. I eventually went back to him cus I love him. Last week he had sex with a married woman and they both took pictures durring the act and I found the pictures on his laptop. I don't know what to do. to let go or forgive him. He has been coming to our house everyday crying for forgiveness. I still love him. I'm so hurt and confuse please I need your advice