Hey AntonyJew, so much to say. First of all, you are incredible and what you are going through is totally and completely normal. You are not alone! I see myself in your description of your struggle.
Practically speaking, I have experience with two areas I think might be helpful.
First of all, about talking to the wife. Obviously each relationship is different. I had been struggling with sex addiction (porn, relationships with boys and girls throughout high-school etc) for 15 years before marriage, since age 5. (Yes, I somehow knew then there was something dirty about it which led to shame, which led to more acting out... and you know the way it goes.) I was convinced marriage would change the game for me. I met this amazing girl and invested a ton into building the relationship. I am a sensitive person and went all in, bh we built an incredibly strong bond even before getting married. I made reference while dating to my struggles, she knew of my past girlfriends etc. but I never went into detail - was too scared, thought she understood from my references and felt there was no point anyhow since that chapter in my life was over. Well guess what. That's right! It wasn't over. A month or so after, I was back at it in earnest. A year into my marriage, I got into gye and faced the fact that I am an addict. I started listening to dov's classes (life changing, but also sometimes off-putting) and got into the 12 steps. I went with the surrender tactic for 80 days (my wife was pregnant, so being together constantly helped, bh our emotional and physical bond is awesome) until I feel again. I was devestated. I was convinced i had broken free. Anyways, another half a year of acting out and i had enough. I was on the verge of suicide. I couldn't handle the lying the sneaking the shame the guilt. I just couldn't. And so one night after summoning up the courage I told my wife after dinner that i had to speak with her. It was the most TERRIFYING thing I have ever done. EVER. I thought I am risking my life. Risking my marriage. Risking everything. But the hell i was facing in the other direction was worse than anything that might happen. bari v'shema bari adif. And so i poured out my heart. I told her everything. Every last detail. Starting from when i was 5. The ups and the downs. The falling and getting back up. The self-loathing and shame. The compulsion. The inability to do what I truly wanted - to break free. And she listened. And she validated me as much as she could. And she respected my courage and honesty. I cried for two days straight, literally. At one point, she - in trying to process this - said that if I couldn't get this under control she couldn't stay with me and I almost died right there on the spot. If I lose her I am finished. She knows that. I am nothing without her. And I tell her that every night. And so we came up with plans to implement. And this speaks to your filter question. We go covenant eyes filter on my laptop and filter on my phone. And with my newfound resolve, I went 85 days again - until I discovered a loophole and crashed last tisha b'av, a year ago. Since then, until 28 days ago, i was stuck in the cycle once more. Of course I tried new filters, new ways, but I wasn't strong enough. I was caught two more times via the good services of covenant eyes (i hate that organization more than anything in the world but they will likely have a tremendous hand in saving my life). And after being caught the second time I decided to begin again in earnest. Reading and posting daily on the forum has been huge for me. All my devices are currently filtered bh. Just tonight i put covenant eyes on my wife phone (hope she doesn't mind!) so it would no longer be a temptation. And I am looking forward to my freedom, one day at a time.
That's my little story (IN SHORT!). Again, every relationship is different so I have no clue if telling is the right thing - you have to know your wife, your marriage, how invested she is, what her nature is, how naive she is, etc etc etc etc etc. But for me, it was a game changer and makes it a heck of a lot easier.
Anyway, that's enough out of me (for now.) I bless you with strength and courage. GYE is saving lives, and I hope you and I will be counted among them.
Shabbat shalom