Help I need a man advice! Husband with another IG

I've been with my partner for about 8 years and we are married. He has always loved looking at half-naked women, nudity, and porn; he loves it, but I am a very jealous person. He has tried watching movies with me, etc., but I feel like I still get jealous, and I even feel a physical ache in my chest feeling attracted to those other women. That has always been a problem, and we used to fight a lot before because he followed a lot of women on Instagram and liked their photos, which bothered me immensely.
Actually, it has always been an issue for us, and he knows I am very jealous; he knows it bothers me. The last time we had a huge fight over it because I get mad every single day about him following women. So, my suspicion was that he had an alternative Instagram account, and apparently he does: he joined in November 2025, which was right when I discovered he signed up for OnlyFans and made an account there. Right now, I don't know what I'm going to do.
I added him from a fake Instagram I made because I wanted to find out if that was his alternative account, he added me back, and I've been checking the hours he logs on. Apparently, he doesn't log on as much as I would have thought; at night he logged on while I was asleep. I don't know if he is actually talking to anyone—I highly doubt it because that doesn't seem to be his attitude, and he doesn't have strange calls or messages. Still, he says it's just like watching porn; he says it's like looking at content, just looking, looking, looking, looking.
The accounts he follows are about 215, and they are all very random, simply sexual content with tons and tons of followers. Apparently, he leaves certain comments like "thank you," stickers, and things like that, like men who watch porn do. I sent him a message from my fake Instagram; I wrote "hola amor" or "hello honey," I don't really remember what I put.
And after that, he left me on read and I haven't seen him log on very much, but I suspect he logs on when I'm asleep or when he goes to the bathroom—I don't know if he does it to look at porn. Aside from that, the truth is he is a really good husband. I don't think he is physically or personally cheating on me with someone in real life, and I don't know what to do because he is also very angry that I cross his personal boundaries. I have his location. So, I feel like he was driven to do it because I don't let him do it in any other way and I'm constantly all over him. But I don't understand why he has to do it through Instagram and why he can't just go to a porn site and be done with it—why he has to consume that specific content. I know that I also like to watch porn sometimes. He never spies on me, never harasses me, and never checks to see if I'm doing things or not. I know he trusts me, trusting that whatever I do won't be something to hurt him. But to a certain point, this hurts me, yet he says it's just watching porn. He says it's something common, like watching stuff on TV that he doesn't care about, that he places no importance on in his life, and that he feels his other relationship problems are much more important, etc.