Help! My (ex) fiance has a porn problem

Friday night we went out drinking and I hardly check his phone. But the one time I did I found a message on what's app to some girl and shes been sending him videos and photos and he's just been requesting more and more. I confronted him about it and asked him who it is. He said it was his "jack off shit". I gave him his ring back right away because I didn't believe him and we've both been drinking. We got home and he started to blame it on a recent passing and then later he said it was because he was feeling rejected by me and then he finally admitted and accepted the fact that he had a problem with porn. He showed me everything the next day. But at that point I didn't want to hear it. I just felt betrayed that he was texting someone for that. I ended up moving out and he just kept begging me to stay. Idk if I'm doing the right thing or the wrong thing. I'm so confused.