Unplugging his computer when he leaves?

What do you guys make of this, so for months, my SO has been unplugging his computer from the pc not the outlet whenever he leaves. I needed to search something one day and asked how to turn it on. He told me how and it wasn’t working. He said he didn’t know why it wasn’t turning on. I looked and saw it was unplugged but didn’t say anything. When he came home he went in and worked on it to say he had no idea why it wasn’t turning on but it’s working now. Edit: so he would plug it back in and act like he didn’t know why it wasn’t turning on.

Every time he left I would check and see it unplugged. I finally decided I wasn’t imagining it and confronted him. I asked why I couldn’t turn the computer on and he said “when you unplugged it from the wall outlet it sparked something and now you have to wiggle the power cord” a 100% lie. Then I asked how that’s possible and said I saw it unplugged from the back. Then he says he only did that because he thought I was snooping and was unplugging it to see if I would say something. But if he really was leaving it unplugged for privacy or to “catch me” why would he come up with a lie about it needing to be wiggled and not be like oh I did that cause I thought you were going on my stuff. By the way, I’ve only ever asked to use his computer and leave my phone and computer around him no problem. And I don’t care if he goes on my stuff so I don’t need to set some trap to see if he is? Idk it just seems really weird to me.

Edit: he had a very serious porn addiction actually. I don’t even know what to look for to find that stuff though if it’s hidden. I definitely think that if I didn’t tell him I knew, he would have kept doing it. Time to rethink.