why won't he answer me?

So there is this guy. I was joking with him one day about kissing me and he reached over and kissed me (mini makeout) and got a little handsy. I don't want a relationship with him I think we both feel that way, and there is strong sexual tension between us. We have talked about having sex, and he said it will probley end up happening so that shows right there that he's into me. I texted him yesterday about hooking up sometime and he never responded like with any answer. So I texted him today and asked im if I did someting to piss im off and nothing. So what did I do or why isnt' he texting me back. He's the kind of guy that has hookups all the time and doesn't think anything different. I am dating someone and my bf said I could hook up with him, and he knows the guy. could that be why