I discovered my boyfriend's porn addiction about half a year ago and since then he's been determined to fight his addiction for us. Now the event that actually led to him being "exposed" back then was that I discovered his "porn folder" on his phone (he has a habit of sometimes just casually taking my phone and going through stuff, giving me the impression that we don't have anything to hide from each other, so I assumed I could do the same with his (although that was actually the first time that I did it, while he would do it to me regularly in the past 6 months that we had been living together already) Unfortunately, what I discovered in his 'deleted' folder besides what would count as actual pornography was a girl's Facebook profile pictures (3 pictures of the same average-looking girl that pretty much only showed her face), that were obviously in no way whatsoever sexualized or anything of the sort. When I confronted him about these specific pictures, assuming that it was someone he must know since I could not comprehend the sexual attraction in a picture with no nudity or a particularly attractive woman, he told me he did not know this girl personally and he just got a random friend suggestion once and decided that he would just add that suggested friend's pictures to his folder, imagining how she would look like naked, to make it 'pornographic'. When I asked him why he would feel the need to do that with all the actual porn that is out there, he told me he didn't know why. Of course at this point he has deleted his all of his 'material' but of course I never got closure on who that person really is and it still, after 6 months, occupies my thoughts every once in a while. Now by coincidence I've found out about an app that recovers deleted pictures and I am contemplating installing it on my boyfriend's phone so I can do a reverse search on those Facebook profile pictures and maybe find out just who this supposedly random girl is that seemed so attractive to him that he had to permanently download her pictures . Now I know that in some way I would go behind his back by doing that, but it's not because I don't trust him or with the intention of snooping around, it's just for my own peace of mind, although I'm not sure if I'm justifying it wrong in my own mind.. I've tried asking him directly if he remembers her name or the friend she was connected to, but he says he doesn't remember anything about it, and he generally gets mad and defensive when talking about his past, especially about that particular incident. I also tried to go through his friends' friends and find that person, but of course gave up quickly since that is rather pointless. But I just feel like I can't really move on from this feeling of "betrayal" unless I know for sure. Maybe someone could share their perspective on this situation, thank you for reading.