Your CEO is tiptoeing. For at least three reasons. 1. You are married, after all. 2. A relationship between the boss and an employee is a dangerous thing. 3. He is avoiding rejection.
He is a smart guy, he is not going to push much more, I don't think, without you giving him a clear indication of interest. Even then, he will be very cautious. If he isn't, I'd question his judgment, as it could be pretty damaging to his company.
I hate being serious! I think I should get some new socks!
