I'd be a bit leary of asking him over for dinner in such a manner...
have the two of you spent any time together in such a "dating" type manner since he moved out? other than the love making that goes on?
if I were you (and I know I am not) I would stick to getting into more of a routine of cooking for you and son and perhaps start cooking bigger meals when you know h is comming...not because you want to cook FOR him..but because you want to cook and it's more worth it if there is another adult to eat it.
a reason the set up of saying "i've got my eye on someone and wonder how he'd feel about comming over for dinner" before you let him know you would like for him to come over for dinner...makes you look a bit like a hypocrite..unless of course you were planning on sending son off somewhere else when you cook dinner for the mystery man.
