@melanie83,
If you want an easy answer just make sure he doesn't use the Internet. I'm good at easy, simple solutions. If you're not satisfied with what they've told you, I'm still going to offer the simplest thing I can think of. Just stop worrying about it and it'll be fine. The more you worry and play this game the more you're hurting yourself. Just stop. If you like your boyfriend then give him the benefit of the doubt. If you want to play games and make both of you suffer, don't take my advice.