This sounds pretty normal, at least to me. I mean, I'm not married or anything, but it still makes a lot of sense to me. Cheating is more action based in my mind. You can't always control your thoughts or feelings, but you can control what you do. I would say this is normal and although I wouldn't tell him, I still wouldn't worry about it. It doesn't mean you don't love him, and it doesn't mean you're going to cheat on him. It just means your subconscience is explorative.