Relationship advice?

I am 28 weeks pregnant. My boyfriend came to me and showed me some text messages he had with another person who sent naked pictures. He has always been honest with me and good to me and our son jack already. He knows I don’t like the pictures so it shouldn’t happen again. He says he would only mess around with someone else if I’m involved. Which I get I’m a kinky person but I’m not sure if that was right bc I’m extremely faithful and wouldn’t have done that to him. What would you ladies do?