Porn addiction

So my partner has a porn addiction. We’ve been together for 4 years. And he hasn’t been able to stop only slow it down I guess. But once he gets back into the groove of it he will become insanely toxic. He accuses me of cheating and he gaslights me and lies to me even if I’ve caught him with evidence on his phone. It becomes a living hell for me. I mentally force myself to believe him because I want to be a good partner and prove that I’m working on my trust. My reality becomes unreal. And when I find out the truth I have to take a lot of time to sit with myself mentally and now remind myself I was right and that I wasn’t crazy or whatever names he would say I was for catching him. It’s a cycle and every time after I catch him it feels like he love bombs me. He acts like I’m the most attractive woman and partner and that I’m smart and kind and blah blah. I know I am a good mother and I know I’m a good partner. I have my flaws and I make mistakes just like him but I try to work on them. I love him but I am tired. And I am exhausted and I am sad. We agreed on getting couples therapy now that we can afford it but honestly I don’t know if I see this changing. Does anyone else have any experience in relationships with porn addiction? Does it get better? (Also when I say porn addiction he had it before we got together and it effected all parts of his life. He needed it daily and often 2-5 times a day. We realized his addiction when we realized it had given him ED since then he’s been recovering for a little less than 3 years)