Anyone else keep porn hidden from your partners?

Trying to get inside my boyfriends thought process.

He watches porn but still hides it from me. We have been together for 5 years and he still secrets it away in hidden files.

I don't care that he watches, I do to; We used to even watch together sometimes. I'd honestly enjoy being able to watch the scenes/clips he's into because I'm kind of ADD when it comes to what I watch and it's sometimes hard for me to find something I'm interested in. He outright denies ever downloading or watching porn like I'd be upset with him or something.

I was using our computer (the one he's on most) looking for a file from work and when I checked the recently viewed files in VLC I noticed a porn video. Obviously, like a madman I clicked properties to see where the file was and boom, hundreds of gigabytes in a folder hidden deep within the Steam files. I asked about it asked why he felt like he needed to lie about never downloading porn but he acted really ashamed and didn't really give me any answers.

He's generally a more reserved and quiet guy when it comes to 'intimate' things, whereas I'm more open with people I don't even know about the porn I watch than he is with me.

This is kind of going off the rails now, but what would you do if you were in my shoes?