Affair

I've liked this guy for a while, like whilst me and my current boyfriend weren't together. This boy is now offering to take me into the bedroom and show me "how a man does it" I'm interested but I dont want to cheat I don't know what to do 
Edit as I want to stay anonymous: I told the guy I didn't want to cheat on my boyfriend and he respected my decision and has agreed not to speak to me about anything non PG, because we are close friends and we also work together I didn't want things to be awkward between us.