I met this guy and I want to know if he used me ? ?

I met a guy on a social site and well I though we hit it off , I mean he is married and well I thought that we were on the same page about our status but I think it has changed , he said if we hit it off I would not have to worry about money and i would be his mistress and then we had sex and he had no complaints I mean he said he enjoyed himself but now I think I was used for just sex but why was he not just straight forward with me from the jump I am a real and straight forward person and he knew this, if all he wanted was just sex all he had to do was just say that it was a one time thing but he didn't so want should I do ????