Using a concealed camera to have sex with my dormitory companion is disloyal

I've got a bit of a strange situation going on with my roommate. We both have our own rooms, but we decided to share one of them for convenience. It's not like we're into each other or anything, it's just easier to have one place where we can chill out and stuff. But the thing is, he's got this weird habit of sneaking around my room when I'm not there, and I caught him on camera. He's been using a hidden camera to watch me while I'm in my room, and I'm pretty pissed about it. I confronted him about it, but he just shrugged it off like it was no big deal. I don't know, maybe I'm overreacting, but I feel like he's being disloyal. He's been checking me out, watching me while I'm sleeping, and I don't know what to do about it.