It's a very saddening place indeed. Have you considered telling him about rehab or something? If he still lies to you about it a lot, or if he chooses porn over you, you have to move on. Just break up with him. After the breakup, and after sometime, if he really loved you and missed you, knowing the consequence of his actions, he might quit porn and come running to you - IF you matter to him over porn. If he doesn't, you know you deserve better. I'd say give it a month or two. You'll have your answer.