Why would you ask this to your FWB?

My FWB which is a guy (I am a girl), asked me if I missed him?....Why would he ask such a thing, since we are only FWB?...Why he asked this I mean we could talk about others things, but not about missing each other lol....But why did he asked me if I missed him?..by the way I said no!..and he said you are bad..