my [21F] boyfriend [47M] refuses to let me look in his phone after breaking my trust

Very long story short, I ended up snooping on my boyfriend’s phone one afternoon while he was away out of curiosity and suspicion (because I have seen questionable things on his phone in the past). I ended up finding many posts of porn and photos of girls that he had saved on in his reddit account saves. I communicated to him that I was deeply hurt and upset by all of this, because prior to this he had assured me that he does not look at this type of content. I also personally find it something abhorrent to do while in a committed monogamous relationship.

After looking through his phone and arguing about it the first time, we had another discussion which led to me looking at his phone again very briefly on the same app, where I found essentially the same content. After questioning him about some of this very strange stuff, he gave me some shaky answers that were confusing at best, and I still feel like I couldn’t trust what he was saying fully because it just wasn’t adding up to reality. When I told him this, I also told him that in order for me to be able to start trusting him again I would want to look at his phone, or for him to be able to provide proof for his excuses, but every time I suggest this he becomes emotional and refuses.

He will even begin to threaten to break up and will start talking about “incompatibility”. He says that he “broke a moral” which he has always had, which was his individual right to privacy, and he broke it for me to let me look at his phone after he hurt me, and claims that theres just too many personal things on his phone for me to have access to it. I of course understand this perspective, but with our added situational context of him breaking my trust repeatedly it falls incredibly flat in my opinion and just seems like a diversion tactic.

He is remorseful and apologetic, and it does appear that this situation is affecting him. But I constantly feel riddled with feelings of distrust that I want to get rid of but the only thing that he can do is apologize to me constantly. I’m worried that there are even worse things on his phone that he is hiding from me. I’m not sure how I’ll be able to trust him, and it’s beginning to seem like he doesn’t even mind if I don’t trust him fully anymore because he’s making little effort to actually repair it how I would like him to.

TLDR: After seeing porn and women’s nudes on my boyfriend’s phone while looking through it, he refuses to let me look at it again under the guise of “privacy”, but I don’t know how to trust again.