Married? Uh uh. If you have sex with him, prepare to feel used. Or you could both use each other, but that's as far as I see this going. And probably a one-time get-together, actually. You should be happy that you found out that he's married BEFORE you got naked with a virtual stranger. (Trust me, I went through a period in my life about 15 years ago, where I did this a LOT.)