I used to do it. Jesus showed me so much now that I see how bad it is, but before Jesus, you must believe me here everyone, porn can seam as natural as can be and as though there's nothing wrong with it. I'm not saying he's there, it certainly doesn't sound like he is.
You've made mistakes. This is one of HIS. Different from yours maybe, but it's all the same.
As for you,
Jesus wouldn't snoop. Don't snoop.
Jesus would forgive him err' time. Forgive him.
Jesus would only talk to him out of love and say what is in his best interest. Not just what he wants to hear. Do so.
You are NOT not enough for him nor do you fall short of other woman in any way. Beauty does not love. Beauty can cause one to invite demons into their life. Beauty, like money isn't bad, but it's the love of it that's a mistake.
He who lusts after a woman has already commited adultary in his heart. This is in the bible. You said he's a faithful Christian. Then the truth spoken from a loving heart will hit him hard and set him straight. The first sentence is THE WORD OF GOD. Tell him if he believes in God he HAS to impliment that truth. Tell him it's not just for you, it's more for him than it is for you. It's HIS salvation. You being saved does not rely on him, it's HIS salvation. Not that it doesn't hurt you too.
Tell him you two in marriage are one and must stay on that narrow path, or demons will find their way into your marriage.
When I did look at porn I would NEVER have cheated on my gf. (Never had one anyways

) I'm sure he's the same way. But now I see how the two are connected. He needs to see this, and forever expand his understanding.
Malissa. Every bit of pain you have ever been put through because of sexual sin stems from lust. The same thing that your man is giving into. Ask God to give you the wisdom to show him how serious that is. Ask, believe, act in faith, and you WILL recieve.
Love your bro,
Mark.