Boyfriend watches cheat themed porn

Multiple times now I’ve found out that my boyfriend has been watching porn based on people cheating I.e ‘girlfriend gets caught cheating’ that sort of thing.

Is this something I should be worried about? Would anyone else see this as an indication that they are cheating/have cheated and get off on the thought of it?

I don’t know how ridiculous I’m being but it seems a weird thing to continuously get off to. I don’t care that he watches porn but the fact that it’s revolves around cheating makes me seriously worried.