fiancés porn addiction

My fiancé is addicted to porn. This isn't the first time I've tried to help him. Every time I ask him about it he lies and tells me he has stopped and everything is great. Then a couple weeks later he will just come out and tell me since he feels so bad. I need ideas on how I can help him. He says this time he really wants to stop but he needs my help. I am just so hurt but we are going to work through this. We have already turned off the internet on his phone and He wants me to hold onto his computer so he won't be tempted. Any ideas would be appreciated!! Thank you in advance.