suggestions??

My boyfriend of a year just confessed that he watches porn once in a while we have sex a lot that I really don't think he needs to be watching it he says he doesn't do it on purpose that he doesn't want to watch it he wants to stop but he fails and goes back to watching it I don't really know what to do with that, how to help him get away from watching that any suggestions on what I should tell him how to help him??