Its none of his business if you are dating or not. I am sure he got a smile inside because you said you weren't dating/sleeping with anyone. He thinks you are still pining away for him. They are all the same.

Any good plans for the weekend?

Me: 46 FWS: 36
Married and Divorced 4/07, Pregnant 7/07,False R 7/07
Baby Girl born 3/08
Kicked him out because OW: 7/08
5/10 He realized what he had and lost.
Moved home! REMARRIED 3/14/11!!