Why does he want to know what's in my hidden folder so bad? I'm pretty sure he might know that I have videos with other guys in there

So me and this guy are casual and only meet up to hook up, we see each other here and there. I have some videos of myself with a couple other guys in my hidden folder (never explicitly said this to him though). Several months ago, while talking about a nude of myself that I saved in my hidden folder, he mentioned he had pics girls sent him (or with girls or something, I don't exactly remember) in his hidden folder. I assumed it was normal dating pics but it could have been sexual photos too. I didn't ask further because it's not my business, so I find it weird that lately, he seems to be really curious about what's in my hidden folder.

A couple months ago, I asked him to take a video of me giving him oral (I think I've mentioned to him a long time back that I like taking such videos, in general). He takes one of me and when I see him the next time after, he asks to watch the video on my phone. He then asked how many other videos I have like this in my hidden folder, and then says he's joking. I sorta lie and say just this one video we took, and he says "Yeah right" and that was that.

Then the next time after, we take one more video of me going down on him. He doesn't ask to see that one till I see him again (which was just a couple days ago). When I saw him then and he asked to see it, he also asked what other stuff I have in my folder. I told him it's just other stuff of me and that I've also shown him this one nude I have in it. He basically asks to see the other stuff. I tell him "I'll show you next time". To this, he says "You're so secretive" and I tell him that I'm not, and that was the end of our convo. I am not sure how to proceed if this is brought up again.