I'm kinda seeing this guy I met at work. I'm 21 and he's 27. Two weeks ago, he was joking to his boss that he would be going out with me (which did happen that evening). Later, he told me he is not looking for a relationship but just casual dating (friends-with-benefits type). He said "right now let's play the cards we are dealt with and see where they land."
We had sex one night at his house (we were both drunk). Then, he told me he wanted to make all of the girls and the boys jealous of us. He also took me to fancy restaurants and bars afterward. When he introduced me to his neighbors, he put his arm around me. We've also been to movies and concerts together, and he hugs and kisses me quite often when we're alone.
Last week, he texted me and said he had dates lined up for the next two weeks, and there were some other people who would also like to stay in his bed. I did not reply anything, but I've noticed that he often tries to chat / flirt with women (perhaps because of his job, he has to be good at networking).
Yesterday we were working together at a trade show. He kept talking to our guy co-worker about the girls he had dated, and he said everything aloud right in front of me as if I couldn't hear him. So I pretended I didn't hear anything. Later, when he saw me chatting with a cool-looking guy with mohawk hairstyle, his face turned very red. I kinda felt he suddenly became a bit different -- he seemed to be suddenly cooled off, and he did not talk to me for quite a while. We haven't talked or had any contact since the show yesterday.
His boss told me that this guy had a hit on me, but I'm not sure what that means. I think he's kinda of acting weird. I don't know why he told me those things. Anyone has any ideas? What should I do next? Do you think I'm dating a playboy?