What should I do?

Been with my bf for almost 2 years, found out last August that he was getting on craigslist and emailing other females on there, they would talk dirty then send nude photos. He promised he would never do it again, Then found out the following February that he did it again, but didn't send pics this time, just emailed someone once.

Since then I have always been suspicious about his phone, last week I found in his learned words & search history another craigslist personals email address. I don't believe he is sleeping with these people, just sending pics. He's with me any other time besides work.

What would u ladies do? I've confronted him about, but he just gets mad, starts screaming & says he would never do anything to hurt me